Texas Elementary Science TEKS Hub

Kindergarten · §112.2

Students use their senses to observe the natural world. They explore observable properties, magnets, light and shadows, day & night patterns, rocks, weather, plants, and animals. Foundation for all elementary science.

Not STAAR Year — Full Curriculum

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10 Key Vocabulary Words — Kindergarten

Essential science words students encounter and use across all Kindergarten TEKS strands

observe

To use your senses to gather information about something

SEP

property

A characteristic of an object such as shape, color, or texture

Matter

magnet

An object that attracts certain metal objects and can push or pull them

Force

shadow

A dark area made when an object blocks light

Force

weather

The current condition of the sky, such as sunny, rainy, or cloudy

Earth

rock

A solid natural material found in Earth that can be classified by size, shape, color, and texture

Earth

day/night

A repeating pattern caused by Earth's rotation — day is light, night is dark

Earth

plant

A living thing with roots, stems, leaves, flowers, and fruits that needs sunlight and water to grow

Organisms

life cycle

The series of stages a living thing goes through from birth to death

Organisms

classify

To sort or group objects based on shared characteristics

SEP

K.1

Investigations. The student asks questions, identifies problems, and plans and safely conducts classroom, laboratory, and field investigations. The student is expected to: (A) ask questions and define problems based on observations; (B) plan and conduct simple descriptive investigations and design solutions; (C) identify, describe, and demonstrate safe practices; (D) use tools including hand lenses, goggles, trays, sieves, notebooks, terrariums, aquariums, thermometer, rain gauge, tuning fork, flashlights, and plant life cycle model; (E) collect observations and measurements as evidence; (F) record and organize data using pictures, numbers, words, symbols, and simple graphs; (G) develop and use models to represent phenomena or design a prototype.

📘 Key Vocabulary

investigationA planned search to find out something by looking, testing, or experimenting observeTo use your senses to gather information about the world around you evidenceInformation collected during an investigation that supports an explanation modelA drawing, object, or digital representation that shows how something works dataFacts or measurements collected during an investigation toolAn instrument used to observe, measure, or test — such as a hand lens or thermometer recordTo write down or draw what you observe so the information is saved scientistA person who asks questions and investigates the natural world questionSomething you want to find out; the starting point of an investigation patternSomething that repeats in a predictable way

💡 Key Concepts

▸Scientists ask questions about the world around them and plan careful investigations to find answers — this is how science knowledge is built.
▸Tools like hand lenses, thermometers, and rain gauges help scientists observe, measure, and collect evidence that they record in notebooks.
▸Models represent real objects or processes — they can be drawings, physical objects, or digital images that help us understand and explain things.

K.2

Data Analysis. (A) Identify basic advantages and limitations of models; (B) Analyze data by identifying significant features and patterns; (C) Use mathematical concepts to compare two objects with common attributes; (D) Evaluate a design or object using criteria to determine if it works as intended.

📘 Key Vocabulary

dataFacts or measurements collected and used to answer a question patternA repeated or predictable arrangement in data or observations modelA representation that helps explain an object, system, or process compareTo look at two or more things to find how they are alike and different advantageA benefit or good feature of a model or design limitationA flaw or weakness that makes a model incomplete or inaccurate analyzeTo look closely at data to find features and patterns criteriaThe standards or rules used to judge whether a design works as intended measurementA number and unit that describes the size or amount of something featureA noticeable quality or characteristic found in data or an object

💡 Key Concepts

▸Scientists analyze data by looking for patterns and features in the information they collected — patterns help predict what will happen next.
▸All models have advantages (what they show well) and limitations (what they leave out or get wrong) — no model is perfect.
▸A good design or object can be evaluated by checking whether it meets the criteria — the rules or goals it was supposed to achieve.

K.3

Explanations & Communication. (A) Develop explanations and propose solutions supported by data and models; (B) Communicate explanations individually and collaboratively; (C) Listen actively to others' explanations and engage respectfully in scientific discussion.

📘 Key Vocabulary

explanationA statement that uses evidence to describe why or how something happens conclusionA decision or judgment reached after studying evidence communicateTo share ideas, findings, or solutions with others solutionAn answer or plan that solves a problem evidenceFacts and data used to support an explanation collaborateTo work together with others to reach a goal argumentA claim supported by evidence and reasoning discussionA conversation where ideas are shared and examined formatThe way information is organized and presented proposeTo suggest an idea or solution for others to consider

💡 Key Concepts

▸Scientists develop explanations by connecting evidence (what they observed) to a claim (what they think is true) with reasoning.
▸Communicating findings — through drawings, words, or talking — helps others understand and check scientific ideas.
▸Listening carefully to others' scientific explanations and asking questions respectfully helps everyone learn more.

K.4

Scientists & Society. (A) Explain how science or an innovation can help others; (B) Identify scientists and engineers such as Isaac Newton, Mae Jemison, and Ynes Mexia and explore what different scientists and engineers do.

📘 Key Vocabulary

scientistA person who investigates questions about the natural world engineerA person who uses science and math to design solutions to problems innovationA new idea, product, or method that improves something inventionSomething created for the first time to solve a problem contributionSomething a person adds or gives that helps others societyA group of people living together and sharing a culture technologyThe use of science knowledge to create tools and solve problems researchA careful study to discover new facts or test ideas careerA job or profession that a person trains for and does over time impactThe effect or change caused by a person, action, or discovery

💡 Key Concepts

▸Scientists and engineers use their knowledge to create innovations that help people — from medicines to clean water systems to better tools.
▸Many different people become scientists and engineers — Isaac Newton studied forces and gravity; Mae Jemison was the first African American woman astronaut; Ynes Mexia collected over 150,000 plant specimens.
▸Science and engineering work together: scientists discover how things work, and engineers use that knowledge to design solutions to real problems.

K.5A

Patterns: Identify and use patterns to describe phenomena or design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable, regular way repeatTo happen again in the same way predictTo say what you think will happen based on a pattern cycleA pattern of events that repeats over and over sequenceThe order in which things happen regularHappening at equal or predictable intervals designA plan or drawing for how something will be built or work observeTo use your senses to notice details describeTo tell the characteristics of something using words or pictures phenomenonAn observable event or occurrence in the natural world

💡 Key Concepts

▸Patterns are sequences or arrangements that repeat in a predictable way — recognizing a pattern lets scientists predict what will happen next.
▸Natural patterns are everywhere: day follows night, seasons repeat, plants grow in cycles — these patterns help us understand the natural world.
▸Scientists use patterns they observe to design solutions — for example, knowing a plant needs water every day is a pattern used to design a watering schedule.

K.5B

Cause & Effect: Investigate and predict cause-and-effect relationships in science.

📘 Key Vocabulary

causeThe reason something happens effectWhat happens as a result of a cause predictTo use what you know to say what will happen relationshipA connection between two or more things changeWhen something becomes different from what it was before forceA push or pull that can cause motion or change energyThe ability to do work or cause change investigateTo explore carefully to find out how things work evidenceInformation that helps explain why something happened conditionThe state or setting that affects what happens in an experiment

💡 Key Concepts

▸A cause is why something happens; an effect is what happens as a result — pushing a toy car (cause) makes it roll (effect).
▸Scientists investigate cause-and-effect relationships by changing one thing and observing what happens — this helps explain why things occur.
▸Predicting cause-and-effect relationships lets scientists anticipate what will happen before an event — 'If I push harder, the ball will roll farther.'

K.5C

Scale: Describe the properties of objects in terms of relative size (scale) and relative quantity.

📘 Key Vocabulary

scaleThe size of something compared to something else sizeHow big or small something is compareTo look at two things to find how they are alike and different quantityHow many or how much of something there is relativeCompared to something else; not an exact measurement measureTo find the size or amount of something using a tool smallerLess in size or amount than something else largerGreater in size or amount than something else propertyA characteristic that describes an object attributeA feature or quality that describes an object

💡 Key Concepts

▸Scale describes the relative size of things — a mountain is large, a pebble is small, and their sizes can be compared using words like bigger, smaller, heavier, or lighter.
▸Scientists use relative size and quantity to describe and compare objects — comparing is essential because measurements need a reference point to be meaningful.
▸Objects can look the same but differ in size or quantity — understanding these differences helps scientists classify and organize natural objects.

K.5D

Systems: Examine the parts of a whole to define or model a system.

📘 Key Vocabulary

systemA group of parts that work together as a whole partOne piece of a larger whole wholeAll the parts together as one complete thing modelA representation of a system or object functionWhat a part or system does; its job interactWhen parts of a system affect one another componentA single piece or part of a larger system defineTo describe clearly what something is examineTo look at something carefully to understand it connectTo join or link parts of a system together

💡 Key Concepts

▸A system is a group of parts that work together as a whole — a terrarium is a system with soil, water, plants, and animals all working together.
▸Every system has parts, and each part has a job (function) that contributes to the whole system working properly.
▸Examining the parts of a system and how they connect helps scientists understand how the whole system functions and what might happen if a part is removed.

K.5E

Energy & Matter: Identify forms of energy and properties of matter.

📘 Key Vocabulary

energyThe ability to cause change or do work matterAnything that has mass and takes up space lightA form of energy we can see heatThermal energy that flows from warmer to cooler objects soundEnergy that travels as vibrations through matter propertyA characteristic that describes matter solidMatter that has a definite shape and volume liquidMatter that flows and takes the shape of its container formThe shape or type of something, such as a form of energy identifyTo name or recognize what something is

💡 Key Concepts

▸Energy exists in many forms — light, heat, and sound are all forms of energy that we can observe in everyday life.
▸Matter is anything that has mass and takes up space — all objects around us, from rocks to water to air, are made of matter.
▸Energy and matter are different: matter makes up objects, while energy is what causes those objects to change or move.

K.5F

Structure & Function: Describe the relationship between the structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA body part, object, or feature that has a specific form functionWhat a structure does; its purpose or job relationshipThe connection between structure and what it does organismA living thing such as a plant or animal surviveTo stay alive by meeting basic needs rootThe plant structure that anchors it and absorbs water and nutrients stemThe plant structure that supports the plant and carries water leafThe plant structure that captures sunlight for making food finA structure that helps fish steer and move in water wingA structure that allows birds and insects to fly

💡 Key Concepts

▸Every structure (body part or feature) has a function — the function is the job the structure does that helps the organism survive.
▸The shape and form of a structure matches its function — a bird's beak is shaped for the type of food it eats; a root is shaped to absorb water underground.
▸Structure and function are a pair: you can often guess what something does by looking at how it is shaped or built.

K.5G

Stability & Change: Describe how factors or conditions can cause objects, organisms, and systems to either change or stay the same.

📘 Key Vocabulary

stableStaying the same; not changing changeBecoming different from what it was before factorSomething that causes or influences a change conditionThe surrounding state that affects how things behave affectTo cause a change in something remainTo stay the same and not change organismA living thing that can change or stay stable environmentAll the living and non-living things surrounding an organism systemA group of parts that work together and can change respondTo react to a change in surroundings

💡 Key Concepts

▸Some things stay the same (stable), while others change — scientists explain why things change or stay the same by identifying the factors or conditions responsible.
▸Factors like temperature, water, or sunlight can cause objects, organisms, and systems to change — removing or changing these factors can make things stop changing.
▸Scientists predict whether a system will change or stay stable by looking at what conditions are present — if conditions stay constant, the system often stays stable.

K.6

Identify and record observable physical properties of objects, including shape, color, texture, and material, and generate ways to classify objects.

📘 Key Vocabulary

physical propertyA characteristic of matter that can be observed or measured without changing the substance shapeThe outline or form of an object colorThe appearance of an object based on how it reflects light textureHow the surface of an object feels — rough, smooth, bumpy, or soft materialWhat an object is made of, such as wood, plastic, or metal classifyTo sort or group objects based on shared characteristics observeTo use your senses to gather information about an object describeTo tell the characteristics of an object using words sortTo arrange objects into groups by a shared property recordTo write down or draw what you observe

💡 Key Concepts

▸Every object has physical properties — shape, color, texture, and material — that can be observed directly with our senses without changing the object.
▸Physical properties are used to classify objects: objects with similar properties go in the same group — this is why sorting by color, shape, or texture creates organized groups.
▸The same object can be classified in different ways depending on which property you focus on — a red rubber ball can be sorted by color, by shape, or by what it is made of.

🍎 Teacher Guide

📌Begin with a "mystery bag" activity where students reach in and describe an object by feel alone, building the vocabulary of texture, shape, and material before they see it.
📌Provide collections of mixed objects — buttons, rocks, fabric scraps, coins — and ask students to sort them in multiple ways, helping them discover that one object can belong to different groups depending on which property is used.
📌Use anchor charts posted in the room that show and label each property (shape, color, texture, material) so students have a visual reference during science discussions and writing.

K.7

Describe and predict how a magnet interacts with various materials and how magnets can be used to push or pull.

📘 Key Vocabulary

magnetAn object that attracts iron and other magnetic materials attractTo pull something closer; what magnets do to iron objects repelTo push something away; what two like poles of magnets do to each other forceA push or pull; magnets exert a force on certain materials magneticHaving the ability to be attracted to a magnet poleThe end of a magnet where the force is strongest (north or south) pushA force that moves an object away from you pullA force that moves an object toward you materialThe substance an object is made of; some materials are magnetic predictTo say what you think will happen before you observe it

💡 Key Concepts

▸Magnets exert a non-contact force — they can push or pull objects made of iron and other magnetic materials without physically touching them.
▸A magnet has two poles (north and south) — opposite poles attract each other and like poles repel each other.
▸Not all materials are magnetic — only iron, nickel, cobalt, and a few other metals are attracted to magnets; plastic, wood, and glass are not.

🍎 Teacher Guide

📌Introduce magnets through free exploration first — let students test a variety of classroom objects before teaching the vocabulary, so they build their own prediction schema for what is magnetic and what is not.
📌Emphasize the non-contact nature of magnetic force by having students observe the clip or nail moving before the magnet touches it, asking "Is the magnet touching the object yet? — What is making it move?" to build the concept of force at a distance.
📌Create a class sorting chart: "Objects a magnet attracts" vs. "Objects a magnet does not attract," and guide students to notice that all attracted objects are made of the same type of material (iron/metal).

K.8A

Communicate that objects can only be seen when a light source is present and compare effects of different amounts of light on objects.

📘 Key Vocabulary

lightA form of energy that allows us to see objects light sourceSomething that produces light, such as the sun, a lamp, or a flashlight visibleAble to be seen; objects are visible when light reflects off them reflectWhen light bounces off a surface brightHaving a lot of light energy; describing intense light dimHaving little light energy; describing low-intensity light shadowA dark area formed when an object blocks light compareTo look at the effects of different amounts of light observeTo use your eyes to gather information about light energyThe ability to do work; light is a form of energy

💡 Key Concepts

▸Objects can only be seen when a light source is present — in total darkness, no objects are visible because there is no light for our eyes to detect.
▸Light sources produce light — the Sun, lamps, flashlights, and candles are all light sources; the Moon is not a light source because it reflects the Sun's light.
▸The amount of light affects how clearly we see objects — bright light makes objects easier to see, while dim light makes them harder to see.

🍎 Teacher Guide

📌Start in a darkened room with a flashlight to establish that objects become visible only when light reaches them — have students close their eyes in the dark, then open them as you turn on a flashlight, connecting the experience to the concept.
📌Vary the light source intensity (one flashlight vs. three, or move the flashlight closer/farther) and have students describe and compare how clearly they can see the same object at each distance.
📌Link light back to the Sun by asking "Where does most of our light come from during the day?" and help students understand the Sun is Earth's primary light source — a concept that connects directly to K.9A.

K.8B

Demonstrate and explain that light travels through some objects and is blocked by others, creating shadows.

📘 Key Vocabulary

lightA form of energy that travels in straight lines shadowA dark area created when light is blocked by an opaque object opaqueNot allowing light to pass through; blocks light completely transparentAllowing light to pass through clearly translucentAllowing some light to pass through but not clearly travelTo move from one place to another; light travels in a straight line blockTo stop something from passing through; opaque objects block light materialThe substance an object is made of; determines if light passes through demonstrateTo show how something works explainTo give reasons for why something happens

💡 Key Concepts

▸Light travels in straight lines from its source — it does not bend or curve on its own as it moves through the air.
▸When light hits a material, three things can happen: it can pass through (transparent), be partly blocked (translucent), or be completely blocked (opaque).
▸Shadows form when an opaque object blocks light — the shadow takes the shape of the object and forms on the opposite side from the light source.

🍎 Teacher Guide

📌Use a flashlight and a variety of materials (clear plastic wrap, wax paper, construction paper, cardboard) to build a concrete experience of transparent, translucent, and opaque before introducing the terms.
📌Shadow play is the hook — let students make shadow animals on the wall and then guide inquiry: "Why does the shadow look like your hand?" to surface the idea that light travels in a straight line and is blocked by opaque objects.
📌Take students outside on a sunny day to trace their own shadows and observe that the shadow always appears on the opposite side of the object from the light source — reinforcing direction of light travel.

K.9A

Identify, describe, and predict the patterns of day and night and their observable characteristics.

📘 Key Vocabulary

dayThe period of light when the Sun is above the horizon nightThe period of darkness when the Sun is below the horizon patternSomething that repeats in a predictable way; day and night repeat daily cycleA pattern that keeps repeating; the day-night cycle repeats every 24 hours SunThe star at the center of our solar system that provides light and heat to Earth skyThe area above Earth where we see the Sun, Moon, clouds, and stars rotateTo spin around an axis; Earth's rotation causes day and night predictTo say what will happen next based on a pattern observableAble to be seen or noticed using your senses darknessThe absence of light; occurs during the nighttime

💡 Key Concepts

▸Day and night form a repeating pattern caused by Earth's rotation — as Earth spins, one side faces the Sun (day) while the other faces away (night).
▸During the day, the Sun appears to move across the sky from east to west — this is caused by Earth's rotation, not by the Sun actually moving.
▸Night is characterized by darkness and the visibility of the Moon and stars — during the day, stars are still there but the Sun's light prevents us from seeing them.

🍎 Teacher Guide

📌Build the day-night pattern through a recurring classroom routine — keep a simple chart where students stamp a sun or moon icon each morning and evening, establishing the predictable daily pattern before any formal teaching.
📌Use a globe and a flashlight to model day and night, rotating the globe slowly so students see how one side is lit (day) while the other is dark (night) — this concrete model makes the cause tangible even for 5-year-olds.
📌Address the common misconception that night is caused by clouds or the Sun "going away" by demonstrating that the Sun is always shining on some part of Earth — only Earth's rotation changes which side faces the Sun.

K.9B

Observe, describe, and illustrate the Sun, Moon, stars, and objects in the sky such as clouds.

📘 Key Vocabulary

SunThe closest star to Earth; it provides light and heat MoonEarth's natural satellite that orbits Earth and reflects sunlight starA huge ball of hot gas in space that produces its own light skyThe space above Earth where we observe the Sun, Moon, clouds, and stars cloudA collection of tiny water droplets or ice crystals floating in the sky observeTo use your senses to notice objects and events in the sky illustrateTo draw or create a picture to show what something looks like describeTo tell the characteristics of something using words lightEnergy from the Sun or stars that allows us to see orbitThe path one object takes around another object in space

💡 Key Concepts

▸The Sun is a star — it is the closest star to Earth and the source of light and heat that makes life on Earth possible.
▸The Moon orbits Earth and reflects the Sun's light — it does not produce its own light; its appearance changes as it moves around Earth.
▸Stars, including the Sun, are huge balls of hot, glowing gas — at night we can see many distant stars as tiny points of light in the sky.

🍎 Teacher Guide

📌Establish the Sun, Moon, and stars as sky objects through daily observation journals — have students draw what they observe in the sky each morning and record moon observations weekly with family, building longitudinal awareness.
📌Use scale carefully at this grade: students do not need to understand exact distances, but they should understand that the Sun is a star and that stars are very far away — use darkness and a pinhole lamp to simulate why stars look like tiny dots.
📌Distinguish between things we can see in the daytime sky (Sun, sometimes Moon, clouds) and the nighttime sky (Moon, stars, planets), and ask students why we cannot see stars in the day — guiding them toward the idea that the Sun's brightness overwhelms starlight.

K.10A

Describe and classify rocks by observable properties of size, shape, color, and texture.

📘 Key Vocabulary

rockA solid natural material made of minerals found in or on Earth mineralA naturally occurring solid substance that makes up rocks propertyA characteristic used to describe and classify rocks sizeHow big or small a rock is shapeThe form or outline of a rock colorThe visual appearance of a rock based on its mineral content textureHow a rock's surface feels — rough, smooth, or grainy classifyTo sort rocks into groups based on shared properties observeTo use your senses to study the properties of rocks compareTo look at two or more rocks and describe how they are alike and different

💡 Key Concepts

▸Rocks are solid natural materials found in and on Earth — they can be classified by observable properties: size, shape, color, and texture.
▸Rocks come in many sizes, from tiny pebbles to huge boulders — the size of a rock is one of its physical properties that can be used to classify it.
▸The texture of a rock — rough, smooth, jagged, or glassy — reflects how it formed and what it is made of; texture is an important property for rock identification.

🍎 Teacher Guide

📌Create a rock collection station in the classroom where students handle, compare, and sort rocks using hand lenses — allow abundant exploration time before formalizing classification, because tactile experience is essential at this age.
📌Avoid teaching that rocks are just "hard" — show students pumice (floats, soft enough to scratch with a fingernail), obsidian (glassy and sharp), and sandstone (crumbly) to expand their understanding of rock properties.
📌Connect rocks to their environment by asking where students have seen rocks — roads, buildings, jewelry, pencils (graphite) — helping students see that rocks are natural resources humans use every day.

K.10B

Observe and describe weather changes from day to day and over seasons.

📘 Key Vocabulary

weatherThe current state of the atmosphere, including temperature, precipitation, and wind temperatureA measure of how hot or cold something is precipitationAny form of water that falls from clouds — rain, snow, sleet, or hail cloudA mass of tiny water droplets or ice crystals floating in the sky windMoving air; caused by differences in air temperature and pressure seasonOne of four repeating times of year: spring, summer, fall, winter changeTo become different; weather changes from day to day observeTo use your senses to notice weather conditions describeTo tell about weather using words like sunny, cloudy, or rainy patternA change that repeats predictably, such as seasonal weather patterns

💡 Key Concepts

▸Weather describes the current state of the atmosphere — it includes properties like temperature, precipitation (rain, snow), wind, and whether the sky is clear or cloudy.
▸Weather changes from day to day and follows seasonal patterns — summers are typically hotter, winters are cooler, and precipitation varies by season and location.
▸Observing and recording weather data over time reveals patterns — these patterns help meteorologists predict future weather.

🍎 Teacher Guide

📌Weather observation must be a daily ritual, not a unit — spend 2 minutes every morning describing and recording the day's weather on a class chart, building the data set that reveals seasonal patterns over weeks.
📌Teach weather vocabulary (sunny, cloudy, rainy, windy, foggy, snowy) through sensory experience — on rainy days, step outside briefly with umbrellas; on windy days, watch how flags and leaves move.
📌Avoid conflating weather and climate at this grade — focus exclusively on current, observable conditions; the concept of patterns across seasons will emerge naturally from the ongoing observation chart.

K.10C

Identify evidence that air is all around us and demonstrate that wind is moving air.

📘 Key Vocabulary

airThe mixture of gases that surrounds Earth; we breathe it and it moves as wind windMoving air; created when air moves from one place to another evidenceSomething that shows or proves a fact; moving objects show that air is present invisibleUnable to be seen; air is invisible but its effects can be observed movementA change in position; moving objects reveal that air is pushing on them flagAn object that shows wind direction and speed by how it flutters pinwheelA toy with blades that spin when wind pushes on them windsockA tool that shows wind direction by which way it blows out demonstrateTo show or prove something through action identifyTo name or recognize what something is

💡 Key Concepts

▸Air is a real substance made of gases — even though we cannot see it, we know air is present because it can be felt as wind and because objects like flags and pinwheels move when air pushes on them.
▸Wind is moving air — air moves from areas of higher pressure to lower pressure, creating the wind we feel on our skin and see affecting objects around us.
▸Evidence that air exists includes: leaves rustling, flags waving, pinwheels spinning, and the ability of wind to carry objects — these are all caused by moving air.

🍎 Teacher Guide

📌Begin with the misconception check — ask "Can you see air? Can you feel it? Does that mean it isn't there?" to launch inquiry before providing evidence, activating thinking about invisible but real substances.
📌Use student-designed wind detectors — paper pinwheels, strips of tissue paper, or soap bubbles — to make invisible air visible through its effects on other objects, reinforcing that evidence of something is not the same as seeing it directly.
📌Connect air to weather: wind is moving air, and wind can be strong (hurricane) or gentle (breeze) — use local weather data to discuss how wind changes and what it can do, bridging to K.10B observations.

K.11

Observe and generate examples of practical uses for rocks, soil, and water.

📘 Key Vocabulary

rockA solid natural material used for building, tools, and decoration soilThe top layer of Earth's surface made of minerals, water, air, and organic matter waterA liquid natural resource essential for all living things natural resourceA material from nature that living things use useTo make practical application of something practicalUseful in everyday life; having a real-world application observeTo notice the properties and uses of natural materials generateTo create or produce ideas or examples exampleA specific case that shows or explains a general idea livingDescribing organisms that need resources like soil, water, and rocks to survive

💡 Key Concepts

▸Natural resources are materials found in nature that people and other living things use — rocks are used for building, soil grows plants, and water supports all life.
▸People use natural resources every day — wood comes from trees, fresh water comes from rivers and lakes, and rocks are used for roads and buildings.
▸Because natural resources are limited, it is important to use them carefully and avoid waste — protecting natural resources ensures they are available for future generations.

🍎 Teacher Guide

📌Take students on a schoolyard walk to find examples of rocks, soil, and water in the natural environment before any instruction, then debrief with "Where did you find it? What was it being used for?" to surface prior knowledge and observations.
📌Use picture books and real objects to show how each natural resource is used — rocks in walls and tools, soil growing plants, water for drinking and cooking — keeping instruction concrete and tied to students' daily lives.
📌Plant seeds in soil as a hands-on connection between the natural resource (soil) and its use (growing food) — caring for the plants over weeks gives students ongoing, meaningful experience with how living things depend on natural resources.

K.12A

Observe and identify the dependence of plants on air, sunlight, water, nutrients in soil, and space to grow.

📘 Key Vocabulary

plantA living organism that makes its own food using sunlight, water, and carbon dioxide sunlightLight energy from the Sun that plants need to make food waterA liquid resource that plants absorb through their roots nutrientA substance in soil that plants need to grow and stay healthy soilThe upper layer of Earth where plants anchor their roots and absorb nutrients airThe mixture of gases that plants need to carry out photosynthesis spaceRoom to grow; plants need space to spread their roots and leaves dependenceRelying on something else to meet a need surviveTo stay alive by getting everything needed absorbTo take in; roots absorb water and nutrients from soil

💡 Key Concepts

▸Plants depend on five things to survive: air, sunlight, water, nutrients from soil, and space to grow — if any of these is missing, the plant cannot survive.
▸Roots absorb water and nutrients from the soil; leaves capture sunlight; and stems support the plant and carry water — each structure helps meet the plant's needs.
▸Plants are producers — they use sunlight, water, and carbon dioxide from the air to make their own food through photosynthesis, a process unique to plants and algae.

🍎 Teacher Guide

📌Use a hands-on terrarium investigation — have students plant seeds and systematically vary one condition (no water for one plant, no light for another, both for a control) so they observe plant dependence on specific factors from evidence, not just instruction.
📌Build a class anchor chart titled "What Plants Need" with labeled pictures — sunlight, water, air, soil, and space — and revisit it whenever plants are discussed throughout the year to reinforce the concept consistently.
📌Connect plant needs to human experiences: "What happens to you if you don't drink water for a long time? What happens to a plant?" — analogies from students' own lives build durable understanding of living-thing dependence.

K.12B

Observe and identify the dependence of animals on air, water, food, space, and shelter.

📘 Key Vocabulary

animalA living organism that must eat other organisms for energy foodEnergy-containing material that animals eat to survive waterA liquid resource that all animals need to survive airThe gas mixture that all animals breathe to get oxygen shelterA place that protects an animal from weather and predators spaceRoom needed by animals to live, move, and find food surviveTo stay alive by meeting all basic needs dependenceRelying on resources or other organisms for survival needSomething necessary for survival habitatThe natural environment where an organism lives and meets its needs

💡 Key Concepts

▸Animals cannot make their own food — they depend on eating plants or other animals to get the energy and nutrients they need to survive.
▸All animals need five things to survive: air to breathe, water to drink, food for energy, space to live, and shelter for protection from weather and predators.
▸Different animals meet their needs in different ways — fish breathe underwater using gills, birds build nests for shelter, and mammals nurse their young with milk.

🍎 Teacher Guide

📌Use picture sorting — photographs of animals in their habitats meeting each need (a bird drinking at a stream, a rabbit eating grass, a bear in a cave) — and have students name which need each picture shows before discussing animal dependence.
📌Create a class chart comparing animal needs side-by-side with plant needs from K.12A, asking "What is the same? What is different?" — this comparison deepens understanding of both standards and the concept of living things' basic needs.
📌Avoid listing "food" as a need for plants — plants make their own food through photosynthesis, which is a critical distinction that prevents the common misconception; clarify that soil provides nutrients, not "food" in the same sense animals eat food.

K.13A

Identify plant structures: roots, stems, leaves, flowers, and fruits.

📘 Key Vocabulary

rootsThe plant structure that anchors the plant and absorbs water and nutrients from soil stemThe plant structure that supports the plant and carries water and nutrients leavesThe plant structures that capture sunlight to make food through photosynthesis flowerThe plant structure involved in reproduction and making seeds fruitThe plant structure that forms from a flower and contains seeds structureA body part of an organism that has a specific shape and job functionThe job or purpose of a structure identifyTo name and recognize the parts of a plant plantA living organism made of roots, stems, leaves, flowers, and fruits seedThe part of a plant that can grow into a new plant

💡 Key Concepts

▸Plants have five main structures: roots (absorb water and anchor the plant), stems (support and transport), leaves (capture sunlight), flowers (reproduce), and fruits (protect seeds).
▸Each plant structure has a specific function — structure and function are paired: the shape of a root helps it absorb water; the broad shape of leaves helps them capture sunlight.
▸Identifying and naming plant structures is the first step in understanding how plants survive — knowing each structure's function explains why plants are shaped the way they are.

🍎 Teacher Guide

📌Provide real plants — potted herbs work well — and ask students to identify structures before telling them names, building observational habits and letting vocabulary attach to real things rather than pictures.
📌Use dissection of a simple fruit (an apple or bean pod) to reveal the seeds inside the fruit, connecting the structures students can see on the outside (flower, fruit) to the reproductive function inside — making structure-function concrete.
📌Build a class anchor chart with an actual plant diagram labeled with roots, stem, leaves, flower, and fruit that stays posted throughout the unit — returning to it regularly cements the vocabulary and structure-function relationship.

K.13B

Identify the different structures that animals have that allow them to interact with their environment.

📘 Key Vocabulary

structureA body part of an animal that has a specific form and job functionThe purpose or job of a body structure interactTo act on or respond to the environment or other organisms environmentThe surroundings of an organism, including living and non-living things finA flat structure on fish that helps with steering and balance in water wingA structure that allows birds and insects to fly clawA sharp curved structure used to grip, climb, or catch prey beakThe mouth structure of a bird, shaped for eating specific foods legsStructures that support an animal's body and allow movement identifyTo name and recognize animal structures and their functions

💡 Key Concepts

▸Animals have external structures that help them interact with their environment — fins help fish swim, wings help birds fly, and claws help animals grip or dig.
▸The structure of an animal's body part is shaped for its function — a webbed foot is shaped for swimming; a long beak is shaped for reaching nectar inside flowers.
▸Different animals have different structures for the same need — eagles use talons to catch prey, while spiders use silk — both are structures for capturing food.

🍎 Teacher Guide

📌Provide animal picture cards and ask students to focus on one body structure at a time: "Look at this animal's feet — what do you notice? What do you think those feet help it do?" before confirming with additional information.
📌Gather students in a circle with real animal items — a feather, a piece of fur, a shell, a scale — and discuss what each structure tells us about the animal it came from and how it helps the animal survive.
📌Connect to students' own bodies: "You have structures too — what do your eyes do? Your fingers? Your skin?" — bridging animal structures to human structures makes the concept of body structure-function universal.

K.13C

Identify and record changes from seed, seedling, plant, flower, and fruit in a simple plant life cycle.

📘 Key Vocabulary

life cycleThe series of stages a living thing passes through from birth to death seedThe beginning stage of a flowering plant's life cycle seedlingA young plant that has sprouted from a seed plantA mature growing organism that produces flowers and fruit flowerThe reproductive structure that produces seeds for the next generation fruitThe structure that surrounds and protects seeds stageOne step in a sequence of changes changeTo become different; plants change as they grow through each stage growthThe process of increasing in size as an organism develops recordTo document the stages of the life cycle through pictures or writing

💡 Key Concepts

▸A plant life cycle is a repeating sequence of stages: seed → seedling → adult plant → flower → fruit → new seed — the cycle begins again with each new seed.
▸Each stage of the plant life cycle looks different from the others — seeds look nothing like adult plants, but they contain the blueprint for the entire plant inside.
▸Life cycles repeat from one generation to the next — a parent plant produces seeds that grow into new plants with the same life cycle as the parent.

🍎 Teacher Guide

📌Grow beans from seed in clear cups against a window so students can observe root development before the shoot emerges — watching the actual stages unfold in real time makes the life cycle sequence concrete and memorable.
📌Use a large classroom life cycle wheel that students physically rotate as the bean plant grows, stopping each week to add an observation and discuss which stage they are currently observing.
📌Sequence the stages by having students draw each stage on a separate card and then physically arrange the cards in order — discussing that the cycle repeats and asking "What started this plant? Where will it end up?" reinforces the cyclic nature.

K.13D

Identify ways that young plants resemble the parent plant.

📘 Key Vocabulary

parent plantThe adult plant that produces seeds from which young plants grow offspringThe young produced by a parent organism resembleTo look like or be similar to; young plants resemble parent plants traitA characteristic that is passed from parent to offspring inheritTo receive traits from a parent similarLooking or acting the same in some ways identifyTo recognize traits that are shared between parents and offspring compareTo look at the parent and young plant to find what is the same seedThe structure a parent plant produces that contains instructions for the offspring reproduceTo make new individuals of the same kind

💡 Key Concepts

▸Young plants inherit traits from their parent plant — they grow to look like the parent plant because seeds carry the genetic instructions of the parent.
▸Similarities between a parent plant and its offspring include: leaf shape, flower color, fruit type, and overall plant structure — these are inherited traits.
▸Even though young plants start as tiny seedlings that look different from adults, they share characteristics with their parents that become visible as they grow.

🍎 Teacher Guide

📌Provide parent-offspring picture pairs and ask students to point out what looks the same — leaf shape, flower color, overall structure — before discussing inheritance, building observational evidence for the concept.
📌Grow two generations of fast-growing plants (radishes take about 3–4 weeks) so students can observe the parent plant produce seeds and then watch the offspring grow to look like the parent — lived experience is far more powerful than pictures.
📌Avoid introducing the word "genetics" at this grade; focus on the observable fact that offspring look like their parents because "the instructions for how to grow are inside the seed" — a developmentally appropriate explanation that does not require molecular biology.

Grade 1 · §112.3

Students classify objects by properties, investigate heating and cooling, explore pushes/pulls, study seasons and soils, and learn about animal structures, food chains, and life cycles.

Not STAAR Year — Full Curriculum

📚

10 Key Vocabulary Words — Grade 1

Essential science words students encounter and use across all Grade 1 TEKS strands

heat

Thermal energy that flows from a warmer object to a cooler one; causes many changes in materials

Force & Energy

force

A push or pull that can change an object's motion or position

Force

season

One of four repeating parts of the year: spring, summer, fall, and winter

Earth

soil

Loose material covering Earth's surface made of minerals, rock particles, and organic matter

Earth

texture

How the surface of an object feels — smooth, rough, bumpy, or soft

Matter

food chain

A sequence showing how energy passes from one organism to another through eating

Organisms

motion

The act of moving; a change in position of an object over time

Force

reversible

A change that can be undone, such as melting butter that can be cooled back to solid

Matter

conservation

The careful use and protection of natural resources to avoid wasting them

Earth

structure

A part of a living thing, like a fin, wing, or root, that helps it survive in its environment

Organisms

1.1

Investigations. Same four-part framework as Kindergarten with expanded tools including: hand lenses, goggles, heat-resistant gloves, beakers, sieves, tweezers, primary balance, stream tables, soil samples, windsock, pinwheel, student thermometer, flashlights, sandpaper, magnets, and animal life cycle models. (A) Ask questions; (B) Plan and conduct descriptive investigations and design solutions; (C) Demonstrate safe practices; (D) Use listed tools; (E) Collect observations and measurements; (F) Record and organize data; (G) Develop and use models.

📘 Key Vocabulary

investigationA planned, careful search for answers using observations and measurements hypothesisA testable prediction about what will happen in an investigation variableSomething that can change in an experiment toolAn instrument used to observe, measure, or test measurementA number and unit describing the size or amount of something balanceA tool used to measure the mass of objects dataInformation collected during an investigation safetyFollowing rules and using equipment properly to prevent injury recordTo write down or draw what is observed modelA representation that shows how something looks or works

💡 Key Concepts

▸Scientific investigations are planned, careful searches for answers — scientists choose tools that fit the question (a thermometer for temperature, a balance for mass) and record observations as evidence.
▸Safety is always the first priority in science — wearing goggles protects eyes, using heat-resistant gloves prevents burns, and following rules keeps everyone safe.
▸Models represent real phenomena — a model of the Sun-Moon-Earth system shows orbits, even though the model cannot show the true size or distance between objects.

1.2

Data Analysis. (A) Identify advantages and limitations of models; (B) Analyze data by identifying significant features and patterns; (C) Use mathematical concepts to compare two objects with common attributes; (D) Evaluate a design or object using criteria.

📘 Key Vocabulary

dataObservations and measurements collected during an investigation patternA repeated or predictable arrangement in data analyzeTo study data carefully to find features and relationships compareTo look at two or more things to find similarities and differences modelA representation of an object or process used to explain ideas limitationA weakness or flaw that makes a model less than perfect advantageA benefit or positive feature of a model or design criteriaThe rules or standards used to evaluate whether a design works mathematicalUsing numbers, counting, or measuring to describe things evaluateTo judge whether something works as intended based on criteria

💡 Key Concepts

▸Data becomes useful when it is analyzed — scientists look for significant features and patterns in their data to draw meaningful conclusions.
▸Every model has limitations — a clay model of Earth is the right shape but the wrong size, texture, and material, which are its limitations.
▸Scientists evaluate designs by checking them against criteria — if a bridge holds 10 books and the goal was 5, the design meets its criteria successfully.

1.3

Explanations & Communication. (A) Develop explanations and propose solutions; (B) Communicate explanations individually and collaboratively; (C) Listen actively and engage respectfully in scientific discussion.

📘 Key Vocabulary

explanationA statement using evidence to describe why or how something happens evidenceData or observations that support an explanation solutionAn answer or plan that solves a problem communicateTo share information, ideas, or findings with others collaborateTo work together with others toward a shared goal scientific discussionA conversation where evidence and ideas are shared respectfully conclusionA judgment based on evidence collected during an investigation formatThe way information is organized and shared proposeTo suggest a possible explanation or solution supportTo back up a claim with evidence and reasoning

💡 Key Concepts

▸Scientific explanations are supported by evidence — 'The ice melted because we added heat' is an explanation supported by the observation that ice becomes liquid when warmed.
▸Communicating science clearly means choosing the right format — a graph shows data patterns better than words; a diagram shows how something works better than a paragraph.
▸Scientific discussions are respectful exchanges of evidence-based ideas — listening to disagreement and responding with evidence (not opinions) strengthens scientific understanding.

1.4

Scientists & Society. (A) Explain how science or innovation can help others; (B) Identify scientists and engineers such as Katherine Johnson, Sally Ride, and Ernest Just.

📘 Key Vocabulary

scientistA person who asks questions and investigates the natural world engineerA person who uses science to design solutions to real-world problems innovationA new idea or method that improves something or solves a problem contributionWhat a person adds or gives that helps others or advances knowledge societyA community of people who live and work together inventionSomething created for the first time to solve a problem researchA careful study to discover new knowledge impactThe effect or result of a scientific discovery or technology technologyTools and methods created using scientific knowledge careerA job or profession that a person trains for over time

💡 Key Concepts

▸Scientists have made discoveries that changed how we live — Katherine Johnson calculated rocket flight paths that made space travel possible; Sally Ride was the first American woman in space.
▸Engineers use science knowledge to design solutions — Ernest Just discovered how cells work, and that knowledge has been used to engineer better medical treatments.
▸Science and technology shape society — new inventions and discoveries improve health, communication, transportation, and quality of life for people around the world.

1.5A

Patterns: Identify and use patterns to describe phenomena or design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable, regular way seasonA repeating time of year with recognizable weather characteristics cycleA pattern of events that repeats over and over predictTo say what you think will happen next based on a pattern sequenceThe order in which events happen in a cycle repeatTo happen again in the same way weatherConditions in the atmosphere that follow seasonal patterns describeTo explain the characteristics of a pattern using words phenomenonAn observable natural event, such as a change in season designTo plan a solution based on observed patterns

💡 Key Concepts

▸Patterns in science help us make predictions — the pattern of seasons (spring → summer → fall → winter) repeats every year, so we can predict that summer will follow spring.
▸Patterns can be found in living things, weather, the sky, and matter — a butterfly's wing design is a symmetrical pattern; day following night is a temporal pattern.
▸Using patterns to design solutions means applying what repeats in nature — for example, designing a watering system that releases water on a pattern matching when plants need it.

1.5B

Cause & Effect: Investigate and predict cause-and-effect relationships in science.

📘 Key Vocabulary

causeThe reason something happens effectWhat results from a cause pushA force that moves an object away; a cause of motion change pullA force that moves an object closer; a cause of motion change heatThermal energy that causes materials to change predictTo say what you think will happen before you test it relationshipThe connection between a cause and what results from it investigateTo carefully explore to find the cause of something changeBecoming different as a result of a cause evidenceInformation showing that one thing caused another

💡 Key Concepts

▸Cause-and-effect relationships explain why things happen — pushing a swing (cause) makes it move (effect); removing water (cause) causes a plant to wilt (effect).
▸Investigating cause-and-effect means changing one thing and observing what happens — scientists keep everything else the same so they can identify the single cause.
▸Cause-and-effect relationships can be predicted: 'If I heat butter, it will melt' — knowing the cause (heat) helps predict the effect (melting).

1.5C

Scale: Describe the properties of objects in terms of relative size and relative quantity.

📘 Key Vocabulary

scaleThe relative size of something compared to something else sizeThe measurement of how big or small something is massThe amount of matter in an object, measured with a balance compareTo study two or more objects to find how they are alike and different heavierHaving more mass than another object lighterHaving less mass than another object largerGreater in size than another object smallerLess in size than another object quantityHow much or how many of something there is attributeA measurable or observable quality used to compare objects

💡 Key Concepts

▸Scale describes the relative size of things — a horse is larger than a mouse; a boulder is heavier than a pebble — comparing sizes and quantities helps us understand the natural world.
▸Relative size uses reference points — 'This rock is larger than my hand' is a meaningful scale comparison; science often compares objects to familiar references.
▸Quantity matters in science — more water causes more erosion; more sunlight causes faster plant growth — understanding how quantity affects outcomes is essential to science.

1.5D

Systems: Examine the parts of a whole to define or model a system.

📘 Key Vocabulary

systemA group of parts that work together to function as a whole partA single piece of a larger system wholeAll parts together functioning as one unit functionThe job that each part of a system performs organizedArranged in a way so parts work together properly componentOne piece or element that makes up a larger system modelA representation of a system and how its parts relate examineTo look carefully at the parts of something interactWhen parts of a system affect each other defineTo describe clearly what a system is and what it does

💡 Key Concepts

▸A system is made of organized parts that work together — a toy car is a system of wheels, axle, body, and sometimes a motor — each part contributes to the whole.
▸Systems can be taken apart and put back together — doing this helps us understand each part's role and how all the parts interact within the whole.
▸When one part of a system is missing or broken, the whole system may not work properly — this shows how parts are interdependent within a system.

1.5E

Energy & Matter: Identify forms of energy and properties of matter.

📘 Key Vocabulary

energyThe ability to cause change or do work matterAnything that has mass and takes up space heatThermal energy that flows from warm to cool; a form of energy lightA form of energy we can see soundEnergy that travels as vibrations through matter solidA state of matter with a definite shape and volume liquidA state of matter that flows and takes the container's shape propertyA characteristic that describes matter or energy formThe type or state something takes, such as a form of energy thermal energyThe total energy of the moving particles within a substance

💡 Key Concepts

▸Energy exists in many forms: heat, light, sound, and motion (mechanical energy) — these forms can be transformed from one to another.
▸Matter is everything that has mass and takes up space — it exists as solids (definite shape), liquids (takes container's shape), and gases (fills any space).
▸Energy and matter interact — heat (energy) causes matter to change state; light (energy) allows us to see matter; sound (energy) is produced by vibrating matter.

1.5F

Structure & Function: Describe the relationship between structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA body part or physical feature of an organism or object functionThe job or purpose of a structure organismA living thing including plants, animals, and other life forms adaptationA structure or behavior that helps an organism survive finA body structure that helps fish move and steer in water wingA body structure that allows some animals to fly rootThe plant structure that anchors and absorbs water and nutrients beakA bird's mouth structure shaped for eating specific food relationshipThe connection between what a structure looks like and what it does surviveTo stay alive; structures help organisms meet their needs

💡 Key Concepts

▸Every structure has a function — a bird's hollow bones (structure) make it light enough to fly (function); a cactus's thick stem (structure) stores water in dry environments (function).
▸The shape or form of a structure reveals its function — a broad, flat leaf is shaped to capture maximum sunlight; a streamlined fish body is shaped to move through water with less resistance.
▸Structure-function relationships appear in objects too — the curved shape of a spoon (structure) holds liquid (function); the rubber grip on a tool (structure) improves safety (function).

1.5G

Stability & Change: Describe how factors or conditions can cause objects, organisms, and systems to change or stay the same.

📘 Key Vocabulary

stableRemaining the same; not undergoing change changeBecoming different from before factorA condition that can cause or influence a change conditionThe surrounding state of an environment organismA living thing that responds to changes in conditions systemA group of parts that can remain stable or change respondTo react to a change in conditions environmentThe surroundings that affect whether something changes or stays the same predictTo say whether something will change or stay stable based on conditions stable conditionA state in which things remain the same and function normally

💡 Key Concepts

▸Stability means things stay the same; change means things become different — scientists identify the factors that cause change or maintain stability in a system.
▸A system is stable when conditions support it — a plant is stable when it has water, light, and nutrients; remove one factor and the plant begins to change (wilt).
▸Changes can be predicted by identifying which factors are present — if temperature drops below freezing, water will change to ice; if it warms, ice will melt.

1.6A

Classify objects by observable physical properties, including shape, color, and texture, and attributes such as larger/smaller and heavier/lighter.

📘 Key Vocabulary

physical propertyA characteristic that can be observed or measured without changing the substance shapeThe form or outline of an object colorThe visible appearance based on how light is reflected textureHow the surface of an object feels — rough, smooth, or bumpy classifyTo sort objects into groups based on shared properties attributeA quality used to describe and compare objects heavierHaving more mass than another object when measured on a balance lighterHaving less mass than another object largerGreater in size than another object smallerLess in size than another object

💡 Key Concepts

▸Physical properties are observable characteristics of matter that can be measured or described without changing the substance — shape, color, texture, and mass are all physical properties.
▸Classification uses physical properties to sort objects into groups — objects that are the same color, shape, or material are grouped together based on those shared properties.
▸Comparing physical properties — heavier/lighter, larger/smaller — requires measuring both objects with the same tool and applying consistent criteria for comparison.

🍎 Teacher Guide

📌Provide mystery boxes containing common objects (eraser, crayon, penny, cotton ball) and have students describe each by physical properties alone — this develops precise observational vocabulary and shows that properties can uniquely identify objects.
📌Teach students to create sorting rules before sorting: "I will sort by color" or "I will sort by texture" — then have them re-sort the same collection using a different rule to reinforce that classification depends on which property the classifier chooses.
📌Introduce a balance scale for mass comparison — heavier/lighter is a measurable physical property, and using a tool rather than just hefting objects builds the habit of using instruments for scientific measurement.

1.6B

Explain and predict changes in materials caused by heating and cooling.

📘 Key Vocabulary

heatThermal energy that causes materials to change when added or removed coolTo remove thermal energy from a substance, lowering its temperature meltTo change from a solid to a liquid by adding heat freezeTo change from a liquid to a solid by removing heat changeBecoming different; heating and cooling cause physical changes in materials materialThe substance an object is made of predictTo say what will happen to a material when heated or cooled temperatureA measure of how hot or cold something is solidA state of matter with definite shape; forms when a liquid freezes liquidA state of matter that flows; forms when a solid melts

💡 Key Concepts

▸Adding heat to a material can cause it to change — butter melts when heated; water becomes steam when boiled — these are caused by increasing thermal energy.
▸Removing heat (cooling) causes materials to change in the opposite direction — liquid water freezes into ice; melted wax hardens back to solid — cooling removes thermal energy.
▸Some heat-caused changes are reversible (melting/freezing) while others are irreversible (cooking an egg) — the difference depends on whether the material's chemical structure changed.

🍎 Teacher Guide

📌Use reversible changes first (melting butter, freezing water) before irreversible ones (cooking an egg) — establishing the contrast between the two types of heat-caused change is the central conceptual goal of this standard.
📌Have students predict what will happen before heating or cooling each material, then observe and record whether their prediction was correct — this makes the investigation cycle explicit and builds scientific reasoning habits.
📌Connect to cooking through a class recipe activity: discuss which steps involve reversible heat changes (melting chocolate) vs. irreversible ones (baking the batter into a cookie) — real-world context makes the distinction meaningful.

1.6C

Demonstrate and explain that a whole object is a system made of organized parts such as a toy that can be taken apart and put back together.

📘 Key Vocabulary

systemA group of organized parts that work together as a whole partOne component of a larger whole wholeAll parts together functioning as one complete object organizedArranged so that parts connect and work together properly componentA single piece of a larger system assembleTo put parts together to form a whole disassembleTo take apart the pieces of a whole object demonstrateTo show how something works through hands-on activity functionWhat a system or part does; its job modelAn object or drawing that shows how the parts of a system relate

💡 Key Concepts

▸A system is a whole made of organized parts — a toy is a system of parts (wheels, body, axle) that all work together to function as a toy that moves.
▸Taking apart a system (disassembling) and putting it back together (assembling) demonstrates that a whole object is made of organized parts — each part has a specific location and function.
▸Understanding systems in science means identifying parts, their functions, and how they connect — a terrarium is a system; a food chain is a system; the human body is a system.

🍎 Teacher Guide

📌Provide students with a simple toy (like a building-block vehicle) to disassemble completely, lay out all parts, and then reassemble — discussing that the whole needs all its parts and that each part has a specific location is the core learning.
📌Build on the disassembly by asking "What would happen if we left this part out?" before reassembling without it — this establishes that systems require all their organized parts to function properly.
📌Connect the concept of systems to the human body: your hand is a whole system made of bones, skin, muscles, and tendons — zooming out from a toy to a living system extends the concept without adding new vocabulary.

1.7A

Explain how pushes and pulls can start, stop, or change the speed or direction of an object's motion.

📘 Key Vocabulary

pushA force that moves an object away from the source of the force pullA force that moves an object toward the source of the force forceA push or pull that changes an object's motion motionThe act of moving; a change in position over time speedHow fast an object moves; a push or pull can change speed directionThe way something moves; a force can change direction startTo begin moving from a resting position stopTo end motion; a force can bring a moving object to rest changeTo become different; forces change the speed or direction of motion explainTo describe how and why forces affect an object's motion

💡 Key Concepts

▸A force is a push or pull — pushing a ball makes it start moving; pulling a wagon changes its direction; pushing a moving cart stops it — forces change motion.
▸Forces can change an object's motion in three ways: start it moving, stop it moving, or change its speed or direction — a kick (push) can do all three depending on the situation.
▸The strength of a force affects the amount of change — a stronger push makes an object move faster or farther; a gentle push produces a smaller change in motion.

🍎 Teacher Guide

📌Use a push-pull sorting game: show or perform actions (opening a door, pulling a rope, kicking a ball, squeezing clay) and have students identify each as a push or pull — building the vocabulary before applying it to motion change.
📌Set up a ramp-and-ball station where students experiment with different strengths of push and record what happens to speed and distance — they should discover the relationship between force strength and motion change from evidence, not just instruction.
📌Introduce a third force outcome — direction change — by pushing a rolling ball sideways with a gentle push and having students observe that forces can redirect motion, not just start or stop it.

1.7B

Plan and conduct a descriptive investigation that predicts how pushes and pulls change an object's motion.

📘 Key Vocabulary

investigationA planned study to test a prediction about forces and motion predictTo say what will happen to an object when a push or pull is applied pushA force that moves an object away from the source pullA force that moves an object toward the source motionA change in an object's position speedHow fast an object moves after a force is applied directionThe path an object takes after a force is applied descriptive investigationAn investigation that observes and records without testing a specific variable dataObservations recorded while testing how pushes and pulls affect motion evidenceInformation that supports a prediction about how force changes motion

💡 Key Concepts

▸A descriptive investigation of pushes and pulls involves observing how different forces affect motion and recording what happens — no hypothesis is tested; instead, data is collected and described.
▸Predicting how pushes and pulls will change motion requires understanding force: pushing north makes an object move north; a stronger push produces faster or farther movement.
▸Investigation results show that force always has an effect on motion — objects don't change their motion on their own; a force is always the cause of any change in motion.

🍎 Teacher Guide

📌Frame the investigation with a driving question: "Can a push or pull change where something is and how it moves?" — students should plan, test, and collect data before you confirm the answer, ensuring the investigation is authentic.
📌Use consistent data collection tools: a simple data table with columns for "Type of Force," "Strength (gentle/medium/strong)," and "What Happened" builds the habit of organized data recording at Grade 1.
📌Debrief by asking students to generalize: "What did you notice every time you pushed or pulled an object?" — pushing them toward a class conclusion statement rather than simply reporting one trial's result builds scientific reasoning.

1.8A

Investigate and describe applications of heat in everyday life such as cooking food or using a clothes dryer.

📘 Key Vocabulary

heatThermal energy used in everyday activities like cooking and drying thermal energyThe energy of moving particles in a substance; felt as warmth temperatureA measure of how much thermal energy something has sourceWhere energy comes from; a stove is a heat source applicationThe use of something in real life; cooking is an application of heat everyday lifeNormal daily activities in which science concepts are found energyThe ability to cause change; heat is a form of energy investigateTo explore how heat is used in real-world situations describeTo explain how heat is used in a specific everyday example changeWhat heat causes in materials — cooking, drying, melting

💡 Key Concepts

▸Heat is a form of thermal energy that flows from warmer objects to cooler ones — cooking uses heat to change raw food into cooked food by transferring thermal energy into the food.
▸Heat is used in everyday life in many ways: ovens cook food, clothes dryers use heat to evaporate water from wet clothes, and heaters warm buildings in winter.
▸Heat always causes change — adding heat makes things warmer, can melt solids, boil liquids, or change the properties of materials like dough or eggs during cooking.

🍎 Teacher Guide

📌Survey students first: "What things in your home use heat?" — build a class list, then sort by application (cooking, drying, warming) to establish that heat is a form of energy with many everyday uses before any formal teaching.
📌Bring in (or show images of) the actual appliances: a hair dryer, a toaster, an iron — discussing how each uses heat for a specific purpose helps students see that thermal energy is harnessed for intentional outcomes in engineering.
📌Avoid letting students handle hot objects — use images, video, and guided discussion instead, and make safety a teachable moment by asking "Why do cooks wear oven mitts?" which reinforces both the concept and safe practice.

1.8B

Describe how some changes caused by heat may be reversed (e.g., melting butter) and others cannot be reversed (e.g., cooking an egg or baking a cake).

📘 Key Vocabulary

heatThermal energy added to or removed from a material changeBecoming different as a result of adding or removing heat reversibleA change that can be undone by adding or removing heat irreversibleA change that cannot be undone once it has occurred meltA reversible change from solid to liquid when heat is added freezeA reversible change from liquid to solid when heat is removed cookAn irreversible change caused by heat that changes the structure of food bakeAn irreversible change where raw ingredients become a new substance using heat solidA state of matter that can be restored from a liquid by removing heat liquidA state of matter that can be restored from a solid by adding heat

💡 Key Concepts

▸Some changes caused by heat can be reversed — melting butter changes it from solid to liquid, but cooling the liquid butter returns it to a solid; the chemical structure did not change.
▸Some changes caused by heat cannot be reversed — cooking an egg or baking a cake permanently changes the structure of the material; cooling it does not undo the change.
▸The difference between reversible and irreversible change is whether a new substance was formed — melting is physical (no new substance); cooking is chemical (new substance formed).

🍎 Teacher Guide

📌Use a T-chart posted throughout the unit with columns "Reversible (can undo)" and "Irreversible (cannot undo)" — add examples as students encounter them so the chart builds across the unit and becomes a reference tool.
📌The key teaching point is the chemical change vs. physical change distinction, though not using those terms yet: ask "Is it still the same stuff?" after a change — melted ice is still water (reversible/physical); cooked egg is no longer raw egg (irreversible/chemical).
📌Use oobleck (cornstarch and water) as a hands-on example that is neither clearly reversible nor clearly irreversible — the ambiguity generates productive discussion and deepens critical thinking about classification.

1.9

Describe and predict the patterns of seasons of the year such as order of occurrence and changes in nature.

📘 Key Vocabulary

seasonOne of the four repeating periods of the year: spring, summer, fall, winter springThe season after winter when temperatures warm and plants bloom summerThe hottest season with the longest days fallThe season after summer when temperatures cool and leaves change winterThe coldest season with the shortest days patternThe predictable order in which seasons repeat each year predictTo say which season will come next based on the repeating pattern temperatureA measure of how hot or cold the air is; changes with each season changeWhat happens in nature as seasons shift throughout the year cycleThe yearly repeating sequence of seasons

💡 Key Concepts

▸Earth has four seasons that repeat in order every year: spring, summer, fall (autumn), and winter — this pattern is caused by Earth's tilt and orbit around the Sun.
▸Each season has characteristic properties: summer is hot and has long days; winter is cold with short days; spring and fall are transitional with moderate temperatures.
▸Seasonal patterns affect living things — plants bloom in spring, animals may hibernate in winter, and the length of daylight changes predictably with each season.

🍎 Teacher Guide

📌Begin the seasons unit with a year-long weather data chart from the previous year (or use a published climate chart for your city) — asking students to find patterns in the data before teaching gives them ownership of the discovery.
📌Use a classroom calendar to mark seasonal changes throughout the year, adding observations about temperature, daylight, plant changes, and animal behavior so students accumulate longitudinal evidence for seasonal patterns.
📌Correct the common misconception that Earth is closer to the Sun in summer — use a globe and lamp to show that Earth's tilt (not its distance) determines which hemisphere gets more direct sunlight in each season.

1.10A

Investigate and document the properties of different types of soils such as topsoil, clay, and sand.

📘 Key Vocabulary

soilThe loose material on Earth's surface made of minerals, organic matter, and water topsoilThe upper layer of soil; richest in nutrients and organic matter clayA fine-grained soil type that holds water well sandA coarse-grained soil type with large particles that drains quickly textureHow soil feels — coarse, fine, gritty, or smooth particleA tiny piece of mineral or organic matter that makes up soil propertyA characteristic used to describe and compare soil types investigateTo explore and document the characteristics of different soils compareTo look at two or more soil types and describe how they differ absorbThe ability of soil to take in and hold water

💡 Key Concepts

▸Different types of soil have different properties: topsoil is dark and rich in nutrients; clay is fine-grained and holds water well; sand has large particles and drains quickly.
▸Soil properties affect plant growth — plants grow best in topsoil because it has the right combination of particle size, water-holding ability, and nutrients.
▸Comparing soils by their texture, color, and water absorption tells us about their composition and how they were formed from different minerals and organic matter.

🍎 Teacher Guide

📌Create a soil observation lab with three soil types (topsoil, clay, sand) in separate trays — students compare texture, color, smell, water absorption rate, and ability to hold a shape, building a rich multi-property comparison from direct evidence.
📌Add a "soil recipe" class activity where students hypothesize what combination of sand, clay, and organic matter (leaves, dead plant material) would make the best growing soil — then test by planting identical seeds in different mixes.
📌Connect to erosion (1.10B) by asking: "Which soil type do you predict will wash away fastest in a rain?" — allowing students to predict and test bridges the two standards and shows how soil properties affect erosion.

1.10B

Investigate and describe how water can move rock and soil particles from one place to another.

📘 Key Vocabulary

erosionThe movement of rock and soil particles from one place to another by water waterA liquid force that moves soil and rock particles during erosion particleA tiny piece of rock or soil carried by moving water sedimentLoose rock and soil particles that can be moved by water streamA body of moving water that can carry and deposit soil particles depositTo drop sediment in a new location when water slows down investigateTo explore how water moves particles from place to place describeTo explain what happens to rock and soil when water moves over them movementA change in position; water movement causes erosion carryTo transport particles from one location to another

💡 Key Concepts

▸Water is a powerful force of erosion — flowing water picks up rock and soil particles and carries them downstream, depositing them when the water slows.
▸The speed and amount of water affect erosion rate — fast-moving water carries larger particles and causes more erosion; slow water drops sediment (deposition).
▸Water erosion shapes landscapes over time — it carves river channels, creates valleys, and deposits sediment to build new landforms like deltas and floodplains.

🍎 Teacher Guide

📌Use a stream table or a simple spray bottle over a sloped tray of soil to demonstrate that water movement carries soil particles — students should observe the process happening before they describe or explain it.
📌Have students design ways to protect a soil slope from water erosion (adding grass, rocks, barriers) and test their designs — this engineering design extension deepens understanding by requiring students to apply knowledge of erosion causation.
📌Connect to real-world contexts: show images of eroded riverbanks, gullies in bare fields, and mudslides — asking "What do you think caused this?" before students offer explanations develops causal reasoning rooted in the investigation.

1.10C

Compare the properties of puddles, ponds, streams, rivers, lakes, and oceans, including color, clarity, size, shape, and whether it is freshwater or saltwater.

📘 Key Vocabulary

freshwaterWater that contains little or no dissolved salt; found in lakes, rivers, and streams saltwaterWater containing dissolved salts; found in oceans and some seas clarityHow clear or cloudy a body of water appears puddleA small, shallow pool of water on the ground pondA small, still body of freshwater riverA large, flowing body of freshwater that drains into a lake or ocean oceanThe largest body of saltwater on Earth compareTo look at two or more water bodies to find similarities and differences propertyA characteristic used to describe different bodies of water sizeOne property used to compare bodies of water, from puddle to ocean

💡 Key Concepts

▸Different bodies of water can be compared by their properties — size (puddle vs. ocean), flow (still vs. moving), clarity (clear vs. murky), and salinity (freshwater vs. saltwater).
▸Freshwater (rivers, lakes, ponds) contains little dissolved salt and is essential for drinking water, agriculture, and most land-based ecosystems.
▸Saltwater (oceans and seas) covers over 70% of Earth's surface and supports marine ecosystems — it contains dissolved salts that make it undrinkable without treatment.

🍎 Teacher Guide

📌Start with a shared experience: open the classroom door on a breezy day and ask "What do you feel? Can you see it? How do you know something is there?" — establishing that science deals with things we cannot always see but can detect through evidence.
📌Use pinwheels and streamers in different locations (near a vent, outside, in a closed room) to generate data about where wind is present and how strong it is — quantifying invisible phenomena is a key science practice.
📌Connect wind to weather and energy: wind can move boats, power turbines, and carry seeds — these applications build appreciation for air as a resource and bridge to later learning about renewable energy.

1.10D

Describe and record observable characteristics of weather and explain the impact of weather on daily choices.

📘 Key Vocabulary

weatherThe current conditions of the atmosphere including temperature and precipitation temperatureA measure of how hot or cold the air is precipitationWater that falls from clouds as rain, snow, sleet, or hail windMoving air caused by differences in air pressure cloudyDescribing sky conditions when clouds block sunlight sunnyDescribing clear sky conditions when sunlight reaches the ground impactThe effect weather has on daily decisions and activities recordTo write down observable weather characteristics describeTo explain weather conditions using precise words characteristicA feature used to describe the current weather condition

💡 Key Concepts

▸Weather describes current atmospheric conditions — temperature, precipitation, wind speed/direction, and cloud cover are all measurable properties of weather.
▸Weather affects daily decisions — people wear coats when it is cold, carry umbrellas in rain, and stay inside during dangerous storms because weather directly impacts safety and comfort.
▸Recording weather data over time reveals patterns — daily temperature records show seasonal trends; tracking storms shows how weather systems move across regions.

1.11B

Explain why water conservation is important.

📘 Key Vocabulary

conservationThe careful use and protection of natural resources to avoid wasting them waterA vital natural resource that must be conserved natural resourceMaterial from nature that living things depend on wasteTo use more of a resource than necessary protectTo keep safe from harm; we protect water by not polluting it reduceTo use less of a resource scarcityWhen there is not enough of a resource available importantHaving great value; water is important to all living things explainTo give reasons why something is valuable or necessary environmentThe natural world that depends on clean and available water

💡 Key Concepts

▸Water conservation means using water wisely and reducing waste — turning off the tap while brushing teeth, fixing leaks, and taking shorter showers all conserve water.
▸Water is essential for all living things — without clean, available water, plants cannot grow, animals cannot survive, and humans cannot drink, cook, or stay healthy.
▸Water sources like rivers, lakes, and groundwater can be polluted or depleted — conservation practices protect these resources for future generations and ecosystems.

🍎 Teacher Guide

📌Make conservation personal by calculating class water use: "We flush the toilet 25 times a day — each flush uses 1.6 gallons. How much water could we save by fixing a dripping faucet?" — real numbers make abstract conservation concrete.
📌Create a classroom conservation challenge — track water use, paper waste, or electricity over one week with a deliberate conservation effort in the second week — then compare data to see if conservation made a measurable difference.
📌Avoid making conservation feel punitive — frame it as a choice with positive outcomes: "What would our school look like if everyone wasted water vs. saved it?" — empowering students as agents of change is more effective than emphasizing scarcity.

1.12A

Classify living and nonliving things based upon whether they have basic needs and produce young.

📘 Key Vocabulary

livingHaving life; able to grow, respond, reproduce, and use energy nonlivingNot alive; does not grow, respond, or reproduce classifyTo sort living and nonliving things based on their characteristics basic needsThe things every living organism must have to survive reproduceTo make offspring; a characteristic of living things organismA living thing such as a plant, animal, or fungus growTo increase in size or develop; a characteristic of living things energyWhat living things need and use to carry out life processes characteristicA feature that describes living versus nonliving things evidenceObservations used to decide whether something is living or nonliving

💡 Key Concepts

▸Living things can be distinguished from nonliving things by two criteria: they have basic needs (food, water, air, space) AND they produce young (reproduce).
▸A rock does not eat, drink, breathe, or reproduce — it is nonliving. A plant absorbs water, uses sunlight, grows, and makes seeds — it is living.
▸All living organisms share common characteristics: they grow, respond to their environment, need energy, and can reproduce — these traits separate life from non-life.

🍎 Teacher Guide

📌A living/nonliving sort with picture cards is a standard engagement, but push deeper by asking borderline cases: "Is a seed living? Is a dead leaf?" — productive disagreement around edge cases deepens understanding of the criteria.
📌Establish the two criteria explicitly as a class definition: "Living things have basic needs AND can produce young" — post this and return to it whenever a sorting dispute arises, teaching students to use a definition rather than intuition.
📌Avoid the misconception that nonliving things were never alive — a dead tree is nonliving now but was once living; a rock was never living — distinguishing between never-alive and formerly-alive sharpens conceptual clarity.

1.12B

Describe and record examples of interactions and dependence between living and nonliving components in terrariums or aquariums.

📘 Key Vocabulary

terrariumA glass or plastic container that holds a small land ecosystem aquariumA glass or plastic container that holds a small water ecosystem interactionThe way living and nonliving parts of an ecosystem affect each other dependenceWhen one part of an ecosystem relies on another to survive bioticThe living components of an ecosystem abioticThe nonliving components of an ecosystem such as water, soil, and light ecosystemA community of living things interacting with their nonliving environment observeTo watch carefully to notice how living and nonliving things interact recordTo document observations of interactions in a terrarium or aquarium describeTo explain the relationships between organisms and their environment

💡 Key Concepts

▸A terrarium or aquarium is a small ecosystem where living and nonliving components interact — plants need soil, water, and light; animals need food, water, and shelter — all found within the system.
▸Living components (biotic) depend on nonliving components (abiotic) — fish depend on water (abiotic), plants depend on sunlight (abiotic), and decomposers depend on dead organic matter.
▸Observing a terrarium or aquarium reveals interdependence — removing any component (water, light, soil) disrupts the entire system's ability to support life.

🍎 Teacher Guide

📌Build the terrarium or aquarium as a class over several days — discussing each component as you add it (soil, water, plants, small animals, light source) and asking "Why are we adding this? What living thing needs this?" connects biotic and abiotic components.
📌Introduce a controlled disturbance after the system is stable — cover the aquarium light for three days and observe what changes, then uncover it — this cause-and-effect experiment deepens understanding of dependence without harming the organisms.
📌Use the terrarium/aquarium as a living reference throughout the year — returning to observe changes, discussing what is thriving and what is struggling, and asking "What changed in the environment?" keeps the learning ongoing.

1.12C

Identify and illustrate how organisms depend on each other through food chains.

📘 Key Vocabulary

food chainA sequence showing how energy passes from one organism to another producerAn organism that makes its own food using sunlight; usually a plant consumerAn organism that eats other organisms for energy preyAn organism that is eaten by another organism predatorAn organism that hunts and eats another organism herbivoreA consumer that eats only plants carnivoreA consumer that eats only animals energyWhat passes from one organism to the next in a food chain dependTo rely on another organism for food and energy illustrateTo draw a diagram showing the relationships in a food chain

💡 Key Concepts

▸A food chain shows the transfer of energy from one organism to the next — it always starts with a producer (plant) that captures energy from the Sun.
▸Each organism in a food chain depends on the one before it — grasshoppers eat grass; frogs eat grasshoppers; snakes eat frogs — remove one link and the whole chain is disrupted.
▸Arrows in a food chain point in the direction energy flows — from the organism being eaten to the organism eating it, showing how energy moves through an ecosystem.

🍎 Teacher Guide

📌Build food chains from real local examples — the grass, grasshopper, frog, heron food chain works well for Texas — because familiarity with the organisms makes the relationships feel real rather than abstract.
📌Use physical cards with organism names and have students arrange them in sequence, then add arrows — discussing what the arrow means ("energy moves from the eaten to the eater") explicitly, because arrows are a common source of confusion.
📌Introduce disruption scenarios: "What happens if all the frogs disappear?" — students who have built the chain can reason through the cascade effects, which previews food web thinking they will develop in Grade 3.

1.13A

Identify the external structures of different animals and compare how those structures help them live, move, and meet basic needs.

📘 Key Vocabulary

structureA body part of an animal that has a specific form and purpose functionThe job or purpose of a body structure survivalStaying alive by using structures to meet basic needs externalOn the outside of the body; most animal structures are external finA flat structure that helps fish move and steer in water clawA sharp curved structure used to grip, climb, or catch prey wingA structure that allows animals to fly gillsStructures fish use to absorb oxygen from water identifyTo name and describe animal structures and their functions compareTo look at how different animals use different structures to meet the same need

💡 Key Concepts

▸Animals have external structures that allow them to interact with their environment — fins for swimming, wings for flying, claws for gripping, and gills for breathing underwater.
▸Each animal structure is adapted for the environment where the animal lives — webbed feet help ducks swim; hooves help horses run on hard ground; flippers help seals swim.
▸Comparing animal structures reveals how different animals meet the same need in different ways — fish use gills for oxygen; birds use lungs and breathe air; both get the oxygen they need.

🍎 Teacher Guide

📌Compare at least three very different animals (fish, bird, insect) so students see a wide range of structures — this prevents the implicit assumption that all animals have the same basic structure and reveals the diversity of form.
📌Use the "structure → function → habitat" chain: look at the structure, predict its function, then predict what kind of environment the animal likely lives in — this three-step reasoning builds analytical skills.
📌Be careful with the term "legs" — not all animals have the same type of limbs; fins, wings, and legs all serve similar locomotion functions but are structurally different — precision in language matters.

1.13B

Record observations of and describe basic life cycles of animals, including a bird, a mammal, and a fish.

📘 Key Vocabulary

life cycleThe series of stages an organism passes through from birth to death birthThe beginning of an animal's life cycle growthThe process of becoming larger and more developed over time reproductionThe stage in which an organism produces offspring adultA fully grown organism that can reproduce birdAn animal with feathers, wings, and a beak; lays eggs mammalA warm-blooded animal that feeds young with milk fishA cold-blooded aquatic animal with fins and gills stageOne step in the sequence of a life cycle observeTo watch and record the changes that occur at each stage of a life cycle

💡 Key Concepts

▸All animals pass through a life cycle — they are born (or hatch), grow, reproduce, and eventually die — the specific stages differ by species but the pattern is universal.
▸A bird's life cycle: egg → hatchling → juvenile → adult (reproduces by laying eggs); a mammal's life cycle: live birth → infant → juvenile → adult (reproduces by live birth).
▸Observing life cycles reveals how young animals grow into adults that resemble their parents — this is evidence that traits are inherited and that life cycles repeat from generation to generation.

🍎 Teacher Guide

📌Display three life cycle diagrams side by side (bird, mammal, fish) and ask students to find what is the same and what is different before explaining — the comparison drives inquiry and surfaces student thinking for discussion.
📌Use actual egg incubation (chicken eggs work well in Grade 1) to make the bird life cycle concrete and personally observed rather than learned from a diagram — witnessing hatching creates lasting memory.
📌Connect life cycles to the concept of inherited traits (1.13C) by observing that the chick grows to look like its parents — planting the seed for the next standard while keeping the current focus on stages.

1.13C

Compare ways that young animals resemble their parents.

📘 Key Vocabulary

offspringThe young produced by parent organisms parentAn organism that produces offspring resembleTo look like or be similar to; young animals resemble their parents traitA characteristic passed from parent to offspring inheritTo receive a trait from a parent similarSharing characteristics with a parent compareTo look at parent and young animals to find shared traits birdA vertebrate animal; its chicks resemble adult birds mammalAn animal that gives birth to live young that resemble parents identifyTo recognize and name shared traits between parent and offspring

💡 Key Concepts

▸Young animals inherit traits from their parents — a puppy grows up to look like its parent dogs; a kitten grows to look like its parent cats; appearance is passed through generations.
▸Similarities between parents and offspring include physical features (fur color, body shape, eye color) as well as behaviors — these traits are inherited through reproduction.
▸Even though young animals look different from their parents at birth, they grow to resemble them — comparing young and adult animals in the same species reveals inherited traits.

🍎 Teacher Guide

📌Provide parent-offspring picture pairs for many species (not just dogs and cats) to establish that resemblance is universal across all animals — use horses/foals, ducks/ducklings, and bears/cubs for variety.
📌Ask "What traits did you inherit from your parents?" as a personal connection — eye color, hair texture, height tendencies — making the biological concept personally meaningful while staying appropriate for Grade 1.
📌Avoid the misconception that offspring always look exactly like one parent — they inherit traits from both parents and may look like a combination; Grade 1 focuses on similarity, not on genetics or inheritance mechanisms.

Grade 2 · §112.4

Students investigate physical properties, sound energy and engineering design, weather data, natural vs. manmade resources, food chains, pollination, and unique life cycles such as butterflies and frogs.

Not STAAR Year — Full Curriculum

📚

10 Key Vocabulary Words — Grade 2

Essential science words students encounter and use across all Grade 2 TEKS strands

vibration

A rapid back-and-forth movement that creates sound energy

Force & Energy

solid

A state of matter that has a definite shape and volume

Matter

liquid

A state of matter that has a definite volume but takes the shape of its container

Matter

erosion

The movement of rock and soil particles from one place to another by wind or water

Earth

natural resource

A material from nature that people use, such as water, air, soil, and trees

Earth

pollination

The transfer of pollen from one flower to another, allowing plants to make seeds

Organisms

metamorphosis

A process where a young organism completely changes form as it grows (e.g., caterpillar to butterfly)

Organisms

producer

A living thing, usually a plant, that makes its own food using sunlight

Organisms

recycle

To convert waste materials into reusable materials, reducing the use of natural resources

Earth

engineering design

The process of identifying a problem and creating, testing, and improving a solution

SEP

2.1

Investigations. (A) Ask questions; (B) Plan and conduct descriptive investigations and design solutions; (C) Demonstrate safe practices; (D) Use tools including hand lenses, goggles, heat-resistant gloves, beakers, stream tables, thermometer, rain gauge, flashlights, ramps, balls, drums, tuning forks, magnets, and frog/butterfly life cycle models; (E) Collect observations and measurements; (F) Record and organize data; (G) Develop and use models.

📘 Key Vocabulary

investigationA planned study designed to answer a scientific question descriptive investigationAn investigation that observes and records without testing variables variableSomething that can change in an investigation toolAn instrument used to observe, measure, or test thermometerA tool used to measure temperature in Celsius or Fahrenheit rain gaugeA tool used to measure the amount of precipitation tuning forkA metal tool that vibrates to produce sound when struck dataObservations and measurements collected during an investigation modelA representation of an object or process prototypeAn early model of a solution that can be tested and improved

💡 Key Concepts

▸Grade 2 investigations use more precise tools — thermometers measure temperature; rain gauges measure precipitation; tuning forks create measurable vibrations — choosing the right tool improves accuracy.
▸Descriptive investigations observe and record without testing variables — watching how far a ball rolls on different surfaces and recording results is a descriptive investigation.
▸Engineering design is a type of investigation — students identify a problem, brainstorm solutions, build a prototype, test it, and improve it based on results.

2.2

Data Analysis. (A) Identify advantages and limitations of models; (B) Analyze data by identifying significant features and patterns; (C) Use mathematical concepts to compare two objects with common attributes; (D) Evaluate a design or object using criteria.

📘 Key Vocabulary

dataMeasurements and observations collected during an investigation patternA repeated or predictable arrangement found in data analyzeTo carefully examine data to find features and relationships modelA representation used to explain an object or process limitationA weakness that makes a model less than perfectly accurate advantageA benefit of using a particular model criteriaRules used to judge whether a design or model works as intended compareTo examine similarities and differences in objects or data evaluateTo judge whether a design works using established criteria featureA noticeable quality found in data or an object

💡 Key Concepts

▸Analyzing data means looking for significant features — in weather data, a scientist might notice that temperature increases from January to July and decreases again, revealing a seasonal pattern.
▸A model of the water cycle shows evaporation and precipitation but cannot show exact amounts — this is a limitation of the model, and scientists must acknowledge limitations honestly.
▸Evaluating a design requires comparing it to the criteria — if a cup-and-string telephone transmits sound across 3 meters and the goal was 2 meters, the design succeeded.

2.3

Explanations & Communication. (A) Develop explanations and propose solutions; (B) Communicate individually and collaboratively; (C) Listen actively and engage respectfully in scientific discussion.

📘 Key Vocabulary

explanationA statement that uses evidence to describe why or how something happens evidenceData or observations that support an explanation solutionA plan or answer to a problem supported by data communicateTo share scientific findings and ideas with others collaborateTo work together with others to solve a problem argumentationThe process of supporting a claim with evidence and reasoning scientific discussionA respectful conversation about evidence and ideas conclusionA judgment reached after analyzing evidence formatThe way information is organized and presented to an audience proposeTo offer a possible explanation or solution for consideration

💡 Key Concepts

▸A scientific explanation must be supported by evidence collected during an investigation — opinions and guesses are not scientific explanations without supporting data.
▸Scientists communicate in many formats depending on the audience and purpose — a graph communicates data trends; a poster communicates findings to a large audience; a report communicates detailed methods.
▸Scientific argumentation means respectfully challenging ideas with evidence — 'I disagree because my data shows...' is scientific argumentation; 'You're wrong' is not.

2.4

Scientists & Society. (A) Explain how science or innovation helps others; (B) Identify scientists such as Alexander Graham Bell, Marie Daly, Mario Molina, and Jane Goodall.

📘 Key Vocabulary

scientistA person who investigates questions about the natural world engineerA person who designs solutions to problems using science innovationA new idea or method that improves something contributionSomething a scientist or engineer adds that helps society Alexander Graham BellInventor of the telephone; showed that sound can travel electrically Marie DalyFirst African American woman to earn a PhD in chemistry in the US Mario MolinaChemist who discovered that CFC chemicals damage the ozone layer Jane GoodallScientist famous for studying chimpanzees in their natural habitat careerA job or profession in science, technology, engineering, or math impactThe effect a scientific discovery or invention has on society

💡 Key Concepts

▸Scientists from diverse backgrounds have made discoveries that benefit all of humanity — Mario Molina discovered that CFC chemicals were destroying the ozone layer, leading to the Montreal Protocol that protected Earth.
▸Jane Goodall's decades of observation in the wild changed our understanding of chimpanzee behavior and showed that animals have complex social lives and use tools.
▸Every science and engineering discovery builds on previous work — Alexander Graham Bell's telephone built on knowledge of sound and electricity discovered by earlier scientists.

2.5A

Patterns: Identify and use patterns to describe phenomena or design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable way cycleA repeating set of events or changes seasonA repeating time of year with predictable weather characteristics life cycleA repeating series of growth stages in a living organism predictTo say what will happen next based on a pattern repeatTo happen again the same way sequenceThe order in which events happen in a pattern describeTo explain the characteristics of a pattern weatherAtmospheric conditions that follow predictable seasonal patterns observeTo notice and record repeating patterns in nature

💡 Key Concepts

▸Patterns are predictable and repeatable — the life cycle of a frog (egg → tadpole → froglet → adult) is a pattern that repeats for every generation of frogs.
▸Identifying patterns allows scientists to make predictions and design solutions — knowing that floods follow heavy rainfall patterns allows engineers to design flood control systems.
▸Seasonal weather patterns, lunar cycles, and animal migration routes are all natural patterns that scientists study to understand and predict natural events.

2.5B

Cause & Effect: Investigate and predict cause-and-effect relationships in science.

📘 Key Vocabulary

causeThe reason something happens effectThe result of a cause forceA push or pull that causes a change in motion vibrationA rapid back-and-forth movement that causes sound soundEnergy produced when matter vibrates; an effect of vibration erosionThe movement of soil by water or wind; an effect of weather forces predictTo state what effect will result from a given cause investigateTo explore carefully to determine the cause of an event relationshipThe connection between a cause and the effect it produces evidenceInformation showing that one thing caused another

💡 Key Concepts

▸Cause-and-effect thinking drives scientific inquiry — asking 'What caused that?' and 'What will happen if I change this?' leads to testable investigations.
▸In weather, cause-and-effect relationships connect atmospheric conditions to observable phenomena — warm air rising causes clouds to form; cooling air causes precipitation.
▸Investigating cause-and-effect means changing only one variable at a time — if you change both the surface texture AND the slope, you cannot determine which caused a difference in results.

2.5C

Scale: Measure and describe the properties of objects in terms of size and quantity.

📘 Key Vocabulary

scaleThe size of something relative to something else sizeThe measurement of how large or small an object is quantityHow much or how many of something measureTo find the size or amount of something using a tool compareTo examine objects and describe how they are alike and different propertyA measurable characteristic of matter massThe amount of matter in an object volumeThe amount of space a substance takes up flexibleAble to bend without breaking; a physical property rigidStiff and unable to bend; a physical property

💡 Key Concepts

▸Scale and proportion help scientists make sense of the natural world — comparing the size of a raindrop to a lake, or the size of a cell to a human body, helps us understand relative quantities.
▸Measuring objects with standard units (centimeters, grams) allows meaningful comparisons — without a standard unit, saying 'this rock is big' has no shared meaning.
▸Scientists use scale to model things that are too small or too large to observe directly — a model of the solar system uses a scale to represent distances accurately.

2.5D

Systems: Examine the parts of a whole to define or model a system.

📘 Key Vocabulary

systemA group of parts that work together to function as a whole partA single component of a larger whole wholeAll parts together forming one complete unit functionThe job that each part of a system performs modelA representation of a system and how its parts are connected food chainA system in which energy passes from producers to consumers terrariumA small closed ecosystem; a system of living and nonliving parts circuitAn electrical system whose parts work together to allow current to flow examineTo look closely at the parts of a system interactWhen parts of a system affect each other

💡 Key Concepts

▸A food chain is a system — it has parts (producers and consumers) that interact in a specific order, and removing any part disrupts the whole system.
▸A weather system is made of interacting parts — temperature, humidity, air pressure, and wind all interact to produce weather events like thunderstorms or clear skies.
▸Understanding a system requires identifying all its components, knowing what each component does, and recognizing how the components affect each other.

2.5E

Energy & Matter: Identify forms of energy and properties of matter.

📘 Key Vocabulary

energyThe ability to do work or cause change matterAnything that has mass and takes up space soundA form of energy that travels as vibrations through matter heatThermal energy that flows from warm to cool objects lightA form of energy that allows us to see objects solidA state of matter with definite shape and volume liquidA state of matter that flows and takes the shape of its container vibrationThe rapid back-and-forth movement that produces sound energy propertyA characteristic that describes matter or energy formThe type or state something takes; matter exists in solid, liquid, and gas forms

💡 Key Concepts

▸Sound energy is a form of energy produced by vibrating matter — the vibrating guitar string transfers energy to air particles, which carry it as sound waves to our ears.
▸Matter changes form as energy is added or removed — water becomes gas (steam) when heated and solid (ice) when cooled; the matter is the same, but energy changed its state.
▸Energy and matter interact constantly — sunlight (energy) evaporates water (matter); wind (energy) moves soil (matter); heat (energy) melts rock (matter) inside Earth.

2.5F

Structure & Function: Describe the relationship between structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA body part or feature with a specific form functionThe purpose or job of a structure organismA living thing with structures that help it survive beakA bird structure shaped for eating specific types of food leafA plant structure that captures sunlight for photosynthesis rootA plant structure that absorbs water and nutrients finA fish structure that helps with steering and balance wingAn animal structure that allows flight relationshipThe connection between how a structure is shaped and what it does surviveTo remain alive; structures help organisms meet survival needs

💡 Key Concepts

▸In plants, leaves are structured to maximize sunlight capture — broad, flat leaves have more surface area to absorb light, which is their function in photosynthesis.
▸In animals, body structures match the environment where the animal lives — a penguin's flipper is structured for swimming in cold ocean water; a camel's hump is structured for fat storage in desert environments.
▸Human-made objects also show structure-function relationships — a spoon's concave shape holds liquid; an umbrella's curved dome deflects rain — the form always matches the function.

2.5G

Stability & Change: Describe how factors or conditions can cause objects, organisms, and systems to change or stay the same.

📘 Key Vocabulary

stableRemaining the same; not changing changeBecoming different from what it was before factorA condition that can cause or prevent change organismA living thing that responds to changes in conditions systemA group of parts that can remain stable or change conditionThe surrounding state that affects whether something changes weatherAn atmospheric system that changes based on temperature and moisture erosionA change in Earth's surface caused by water, wind, or ice predictTo say whether something will change or stay the same based on conditions respondTo react to a change in conditions

💡 Key Concepts

▸Ecosystems are stable when living and nonliving factors stay within their normal range — when a drought reduces water availability, the ecosystem changes as plants wilt and animals move away.
▸Human activities can disrupt stability — cutting down a forest removes habitat and food sources, causing animal populations to decline; this is a human-caused change to a stable system.
▸Systems recover from change when conditions return to normal — after a flood, an ecosystem eventually returns to stability as plants regrow and animals return.

2.6A

Classify matter by observable physical properties including texture, flexibility, and relative temperature, and identify whether a material is a solid or liquid.

📘 Key Vocabulary

physical propertyA characteristic of matter that can be observed or measured textureHow the surface of an object feels flexibilityThe ability of a material to bend without breaking temperatureA measure of how hot or cold a material feels solidA state of matter with definite shape and volume liquidA state of matter that flows and takes the container's shape classifyTo sort materials into groups based on shared properties observeTo use senses to notice properties of materials compareTo look at two materials and describe how their properties are alike or different materialThe substance from which an object is made

💡 Key Concepts

▸Physical properties of matter can be observed without changing the material — texture (rough or smooth), flexibility (bends or doesn't), temperature (warm or cool), and state (solid or liquid) are all observable properties.
▸Classifying materials by their physical properties helps us choose the right material for a purpose — flexible materials are used for rubber bands; rigid materials are used for bridges.
▸A solid has definite shape and volume — it does not flow or take the shape of its container; a liquid has definite volume but takes the shape of its container.

🍎 Teacher Guide

📌Provide a large, diverse collection of materials (rubber bands, foam, fabric, metal spoons, plastic wrap, wood blocks) and challenge students to sort by each property one at a time before discussing — letting classification emerge from exploration rather than instruction.
📌Introduce the solid/liquid distinction using materials that challenge assumptions: is toothpaste a solid or liquid? Is wet sand? — productive disagreement around borderline cases deepens understanding of how scientists define categories.
📌Connect material properties to engineering design at this grade: ask "If you were making a raincoat, which material would work best and why?" — students must select a property (waterproof) and match it to a purpose, bridging science and engineering.

2.6B

Conduct a descriptive investigation to explain how physical properties can be changed through processes such as cutting, folding, sanding, melting, or freezing.

📘 Key Vocabulary

physical propertyA characteristic of matter that can be changed without creating a new substance changeBecoming different; properties can be changed through physical processes cutA physical process that changes the size and shape of an object foldA physical process that changes the shape of a flat material sandA physical process using abrasion to smooth a surface meltA physical change from solid to liquid caused by adding heat freezeA physical change from liquid to solid caused by removing heat investigateTo test and observe how physical processes change properties descriptive investigationAn investigation that observes and records a physical change reversibleA change that can be undone — melting and freezing are reversible

💡 Key Concepts

▸Physical changes alter the form or appearance of matter without creating a new substance — cutting paper, folding aluminum foil, sanding wood, and melting ice are all physical changes.
▸Physical changes are generally reversible — a melted ice cube can be refrozen; torn paper can be taped together; but some physical changes (sanding) are not easily reversed.
▸The key to identifying a physical change is that the substance's identity stays the same — melted ice is still water (H₂O); folded paper is still paper, just in a different shape.

🍎 Teacher Guide

📌Run the investigation as a stations lab — students rotate through cutting, folding, sanding, melting (teacher-led), and freezing, recording at each station what changed and whether it could be undone — breadth of experience is more important than depth on any single change.
📌Emphasize the key question: "Is it still the same stuff?" — a folded piece of paper is still paper (physical change); sanded wood is still wood, just smaller (physical change) — students who can answer this question understand the core concept.
📌Use "before and after" observation sheets with drawings — students draw the original material, describe the process, then draw and describe the result, which builds scientific observation documentation and reveals conceptual understanding.

2.6C

Demonstrate that small units such as building blocks can be combined or reassembled to form new objects and explain material selection based on physical properties.

📘 Key Vocabulary

physical propertyA characteristic of matter that determines which materials can be combined combineTo join materials together to make something new reassembleTo put materials back together after taking them apart building blockA unit material that can be used to construct larger structures materialThe substance used to build or create an object justifyTo give a reason for choosing a material based on its properties constructTo build something by combining materials designTo plan how materials will be combined to create an object propertyA characteristic that determines whether a material is suitable for a purpose demonstrateTo show how materials can be combined and rearranged

💡 Key Concepts

▸Materials can be combined and reassembled because they keep their physical properties — wooden blocks stacked to form a tower can be taken apart and used for something else.
▸Choosing the right material for a purpose requires knowing its properties — waterproof materials are chosen for rain boots; flexible materials are chosen for rubber bands; strong materials for structures.
▸Engineers select materials deliberately — they justify their choices based on properties: 'I chose aluminum because it is lightweight AND strong for building the airplane wing.'

🍎 Teacher Guide

📌Use a LEGO building challenge as the vehicle for this standard — students build a structure, identify every individual piece (part), and discuss how the organization of parts determines what the whole thing can do.
📌Have students deliberately remove one piece from their structure and describe how the whole is affected — this concretely demonstrates that organized systems require all parts, and that the organization (not just the pieces) matters.
📌Connect material selection to the engineering design process by asking: "If this bridge needed to hold more weight, which material would you swap out and why?" — using property knowledge to justify design decisions.

2.7A

Explain how objects push on each other and may change shape when they touch or collide.

📘 Key Vocabulary

forceA push or pull that can change the shape or motion of an object pushA force that moves an object away from the source collisionWhen two objects push on each other by touching change shapeTo become deformed when a force is applied interactWhen two objects affect each other through contact contactThe physical touching of two objects energyWhat is transferred when objects push on each other during collision motionThe movement of an object that can change as a result of force describeTo explain what happens when objects push on each other explainTo give reasons for why objects change shape or motion during collisions

💡 Key Concepts

▸When two objects collide (touch forcefully), they push on each other — the force of the collision can change both objects' motion and can also change their shape.
▸Forces always act in pairs — when you push on a wall, the wall pushes back on you with equal force; when a ball hits a bat, the ball pushes on the bat and the bat pushes on the ball.
▸The amount of shape change depends on the force and the material — soft clay changes shape easily when pushed; hard steel resists shape change and requires much more force.

🍎 Teacher Guide

📌Use collisions between balls of different sizes and materials to demonstrate that forces act during contact — students observe that both balls change after the collision, building intuition for Newton's Third Law before it is formally named.
📌Demonstrate shape change with clay collisions: drop clay balls onto a hard surface and examine the impressions — the force of collision is preserved as a shape change, making the invisible force visible through its effect.
📌Connect to safety applications: why does a car have a crumple zone? Why do athletes wear padding? — these engineering applications show that understanding collisions has life-saving implications.

2.7B

Plan and conduct a descriptive investigation to demonstrate how the strength of a push and pull changes an object's motion.

📘 Key Vocabulary

pushA force that moves an object away from the direction of the force pullA force that moves an object toward the direction of the force strengthThe size or amount of a push or pull motionThe movement of an object; changed by the strength of a push or pull investigateTo plan and conduct a test to see how force strength changes motion distanceHow far an object moves; greater force causes greater distance speedHow fast an object moves; increased by greater force directionThe path of an object's movement dataObservations recorded while testing how force strength affects motion evidenceInformation showing how the strength of force affects motion

💡 Key Concepts

▸The strength (size) of a push or pull determines how much an object's motion changes — a harder kick sends a ball faster and farther; a gentle tap barely moves it.
▸Investigating how force strength affects motion requires changing only the force while keeping everything else the same — same ball, same surface, same direction — to isolate the cause.
▸Results show a direct relationship: greater force produces greater change in motion — this pattern holds across many types of objects and surfaces.

🍎 Teacher Guide

📌Design the investigation around a fair test: same surface, same object, same starting position — vary only the strength of push (gentle, medium, strong) using a standardized push method (like a rubber band launcher) to control the variable.
📌Graph results as a class bar graph: gentle push = ___ cm, medium push = ___ cm, strong push = ___ cm — the visual pattern of increasing bars makes the direct relationship between force strength and motion change obvious.
📌Ask prediction questions before each trial: "If I push harder than last time, what will happen to the distance?" — requiring students to make and justify predictions before observing develops scientific reasoning.

2.8A

Demonstrate and explain that sound is made by vibrating matter and that vibrations can be caused by a variety of means.

📘 Key Vocabulary

soundA form of energy produced by vibrating matter vibrationA rapid back-and-forth movement that creates sound waves matterThe substance through which sound vibrations travel produceTo create or generate; vibrations produce sound tuning forkA metal instrument that produces a clear sound when struck drumA percussion instrument that produces sound when the surface is struck stringA component of instruments that vibrates to produce sound mediumA material through which sound travels energyWhat sound carries as it travels through matter demonstrateTo show that vibration produces sound

💡 Key Concepts

▸Sound is produced when matter vibrates — a guitar string vibrates when plucked; a drum vibrates when struck; your vocal cords vibrate when you speak; all sound comes from vibration.
▸Vibrations transfer energy through a medium (solid, liquid, or gas) as sound waves — the vibrating object causes nearby particles to vibrate, passing energy outward in all directions.
▸You can feel vibrations that produce sound — place your hand on a speaker or your throat while humming to feel the vibrations that create the sound you hear.

🍎 Teacher Guide

📌Start with a listening walk — take students outside or through the school building and list every sound they hear — then ask "What do you think is vibrating to make each sound?" before any teaching on vibration.
📌Let students feel vibrations directly: place a hand on a speaker playing bass-heavy music, touch a vibrating tuning fork to the surface of water to see ripples, hold a hand to the throat while humming — tactile experience of vibration is essential.
📌Use the "stop the vibration — stop the sound" test: pluck a rubber band, listen to the sound, then hold the band to stop it from vibrating — the sound stops immediately, providing clear cause-and-effect evidence.

2.8B

Explain how different levels of sound are used in everyday life such as a whisper or a fire alarm.

📘 Key Vocabulary

soundA form of energy that travels as vibrations volumeThe loudness or softness of a sound loudHaving high sound volume; appropriate in certain situations softHaving low sound volume; appropriate in quiet settings whisperA very quiet voice used when loud sounds are inappropriate alarmA loud sound used to alert people to danger levelThe intensity or volume of a sound everyday lifeNormal daily activities in which sound is used in appropriate ways explainTo give reasons why different sound levels are used in different situations appropriateSuitable for a given situation; not too loud or too soft

💡 Key Concepts

▸Sound has volume (loudness), which describes the amount of sound energy — loud sounds carry more energy and are appropriate when communicating across distance (a fire alarm); soft sounds are appropriate in quiet settings.
▸Different situations call for different sound levels — whispering in a library (low volume) is appropriate; cheering at a sports game (high volume) is appropriate — context determines the correct level.
▸Very loud sounds can damage hearing — sound levels above 85 decibels over time can cause permanent hearing loss, which is why workers in loud environments wear ear protection.

🍎 Teacher Guide

📌Build a sound level context map of the school: different areas have appropriate sound levels for their purpose (library = quiet, gym = loud, hallway = moderate) — students rate and justify, connecting science to school community norms.
📌Introduce decibels as a unit of sound level measurement — not as a calculation, but as a name for the measurement scale — and show a chart of common sounds and their decibel levels, asking students to find patterns.
📌Connect loud sounds and hearing safety: sounds above 85 dB over time damage hearing — this health connection makes the content personally relevant and gives students a reason to care about sound level awareness.

2.8C

Design and build a device that uses sound to communicate over a distance — engineering design challenge.

📘 Key Vocabulary

soundA form of energy that can carry information over a distance communicateTo share information using sound or other signals distanceThe space between two points; sound must travel this to communicate vibrationThe movement that produces sound; must travel through a medium mediumA material through which sound vibrations travel designTo plan and create a device using sound to communicate engineering designThe process of identifying a problem and designing, testing, and improving a solution prototypeAn early test model of a device that communicates using sound criteriaThe standards a sound communication device must meet to work improveTo make a design work better based on test results

💡 Key Concepts

▸Sound can be used to communicate over a distance because it travels through various media — a string telephone transmits sound vibrations through the string from one cup to another.
▸Engineering a sound communication device requires identifying the problem, designing a solution, building a prototype, testing it, and improving it based on results — this is the engineering design process.
▸The design criteria for a sound communication device include: being able to transmit understandable information over a specified distance using sound energy.

🍎 Teacher Guide

📌Frame the engineering design challenge clearly: the problem is that two people cannot hear each other over a distance of 5 meters; the solution must use sound to carry a message — criteria and constraints should be explicit before designing begins.
📌Allow multiple design iterations — first test, record what works and what doesn't, improve, test again — emphasizing that engineering is a cycle of improvement, not a one-time build.
📌Have students explain WHY their device works using what they know about vibration and sound: "The string vibrates because the voice makes one cup vibrate, and the string carries those vibrations to the other cup" — requiring explanation deepens understanding.

2.9A

Describe the Sun as a star that provides light and heat; explain that the Moon reflects the Sun's light.

📘 Key Vocabulary

SunThe star at the center of our solar system that provides light and heat starA huge ball of hot glowing gas that produces its own light lightEnergy from the Sun that travels to Earth heatThermal energy radiated by the Sun MoonEarth's natural satellite that orbits Earth and reflects sunlight reflectTo bounce light off a surface; the Moon reflects sunlight orbitThe path an object takes as it travels around another object in space solar systemThe Sun and all the objects that orbit it energyWhat the Sun produces and sends to Earth as light and heat observeTo use tools or the naked eye to study objects in the sky

💡 Key Concepts

▸The Sun is a star — it is the closest star to Earth and appears larger and brighter than other stars only because of its proximity; all stars are distant suns.
▸The Sun produces its own light through nuclear fusion — the Moon does not produce light; it only reflects sunlight, which is why it appears to glow in the night sky.
▸The Sun is Earth's primary energy source — it provides light for photosynthesis, heat to warm the planet, and energy to drive the water cycle and weather patterns.

🍎 Teacher Guide

📌Address the Sun-as-star concept carefully — students often think "the Sun" and "a star" are different things — use a photograph of the Sun alongside images of other stars and explain that the Sun looks bigger and brighter only because it is much closer.
📌Demonstrate that the Moon reflects light using a flashlight (the Sun) and a ball painted gray (the Moon) in a darkened room — shining the flashlight on the ball causes the gray surface to appear lit, modeling why the Moon is visible at night.
📌Connect to the water cycle and weather: the Sun provides the energy that heats Earth, drives evaporation, and powers weather — planting the seed for the G4 water cycle standard while establishing the Sun's role as Earth's primary energy source.

2.10A

Investigate how wind and water move soil and rock particles from one place to another.

📘 Key Vocabulary

erosionThe process by which water or wind moves rock and soil particles sedimentLoose particles of rock and soil that can be moved windMoving air that can carry small particles of rock and soil waterA liquid that flows and carries sediment from place to place particleA tiny piece of rock or soil that can be transported transportTo carry material from one location to another depositTo drop sediment in a new location when wind or water slows weatheringThe breaking down of rocks into smaller particles investigateTo explore how wind and water move soil and rock particles observeTo watch and record how water and wind change Earth's surface

💡 Key Concepts

▸Erosion is the movement of rock and soil particles from one location to another — wind and water are the primary agents of erosion, carrying sediment from higher ground to lower areas.
▸The speed and volume of water determine how much erosion occurs — fast-moving rivers cut through rock to form canyons; slow, gentle rain causes minimal erosion.
▸Deposition occurs when wind or water slows and drops the sediment it was carrying — river deltas, sand dunes, and floodplains are all formed by deposition.

🍎 Teacher Guide

📌Use a stream table or sloped tray to demonstrate erosion live: pour water over dry soil, then over soil covered with plastic grass — students observe that the cover dramatically reduces erosion, building both understanding and appreciation for plant cover.
📌Have students collect the eroded sediment in a tray at the bottom of the slope and examine it — discuss where this material came from and where it is going, reinforcing the erosion-deposition sequence.
📌Connect to local Texas contexts: show images of Hill Country erosion along the Pedernales River or Gulf Coast beach erosion — making the science relevant to the state where students live builds engagement and identity as Texas scientists.

2.10B

Measure, record, and graph weather data including temperature and precipitation.

📘 Key Vocabulary

weatherThe current state of the atmosphere including temperature, wind, and precipitation temperatureA measure of how hot or cold the air is; measured in Celsius or Fahrenheit precipitationWater that falls from clouds as rain, snow, sleet, or hail graphA visual display of data that makes patterns easy to see dataMeasurements collected about weather over time measureTo find the amount of something using a tool recordTo write down weather measurements for later analysis patternA repeating trend found in weather data over time thermometerA tool used to measure temperature rain gaugeA tool used to measure the amount of precipitation

💡 Key Concepts

▸Weather data — temperature, precipitation, wind speed, and cloud cover — can be measured, recorded, and graphed to reveal patterns over time.
▸A bar graph comparing monthly rainfall shows which months are wettest and driest — this pattern helps farmers plan irrigation and engineers plan flood control.
▸Analyzing weather data over many years reveals climate patterns — the difference between a single rainy day (weather) and the fact that a region averages 50 inches of rain per year (climate).

🍎 Teacher Guide

📌Implement a year-long weather data collection practice — a 2-minute daily weather observation produces the data students need to identify seasonal patterns by the end of the year, and builds scientific habits simultaneously.
📌Teach students to use a thermometer and rain gauge correctly before data collection begins — checking that readings are accurate (multiple students measuring the same condition) builds precision habits.
📌At the end of each month, have students analyze their class weather chart: "What was the most common weather this month? What patterns do you notice?" — regular data analysis develops the skill of extracting patterns from collected data.

2.10C

Investigate severe weather events and their regional likelihood.

📘 Key Vocabulary

severe weatherDangerous weather conditions such as tornadoes, hurricanes, or hailstorms tornadoA violent rotating column of air extending from a thunderstorm to the ground hurricaneA large tropical storm with strong winds and heavy rainfall thunderstormA storm with lightning, thunder, and heavy rain hailBalls of ice that form in storm clouds and fall to the ground regionA geographic area with specific weather patterns likelihoodThe probability that a weather event will happen in a region investigateTo explore the characteristics of severe weather and where it occurs safetySteps taken to protect people from dangerous weather prepareTo get ready for a severe weather event

💡 Key Concepts

▸Severe weather events are dangerous atmospheric phenomena — tornadoes, hurricanes, blizzards, and severe thunderstorms can cause property damage, injury, and death.
▸The likelihood of severe weather varies by region — tornadoes are most common in 'Tornado Alley' in the central United States; hurricanes form over warm tropical oceans.
▸Preparing for severe weather by knowing safety procedures — seeking shelter, avoiding windows, and following emergency alerts — reduces the risk of injury during severe weather events.

🍎 Teacher Guide

📌Use local Texas severe weather data — tornadoes in North Texas, hurricanes in the Gulf Coast, ice storms in the Panhandle — to make the regional likelihood discussion relevant to where students actually live.
📌Conduct a severe weather safety drill in addition to learning about the science — connecting severe weather knowledge to emergency procedures grounds the content in actionable understanding, not just information.
📌Use weather maps to show students what different severe weather systems look like from above, building spatial reasoning skills and making the connection between map symbols and real weather phenomena.

2.11A

Distinguish between natural and manmade resources.

📘 Key Vocabulary

natural resourceA material from nature that living things use manmade resourceA product created by humans using natural resources renewableA resource that can be replenished naturally in a short time nonrenewableA resource that takes millions of years to form and cannot be quickly replaced materialThe substance used to make products distinguishTo tell apart; to tell the difference between natural and manmade resources waterA natural resource essential for all living things plasticA manmade material created from petroleum woodA natural resource from trees used for building and paper metalA material refined from ore; can be natural or manmade in form

💡 Key Concepts

▸Natural resources are materials found in nature — water, air, soil, sunlight, plants, and animals are all natural resources that living things depend on.
▸Manmade resources are created by humans using natural resources — plastic is made from petroleum; glass is made from sand; paper is made from wood — manmade resources depend on natural ones.
▸The key distinction is origin: if it occurs naturally without human production, it is a natural resource; if it required human processing or manufacturing, it is a manmade resource.

🍎 Teacher Guide

📌Create a "Where Did This Come From?" game: show common objects (plastic bottle, wooden pencil, glass window, paper) and trace each back to its natural resource origin, revealing that all manmade objects start as natural resources.
📌Emphasize that natural resources are limited: "If we cut down all the trees and never plant new ones, what would happen to our supply of wood?" — this plants the seed for conservation thinking that deepens in later grades.
📌Avoid conflating natural resources with renewable ones at this grade — the distinction is natural (from nature, not made by people) vs. manmade (processed/manufactured by people); renewable vs. nonrenewable is a Grade 4 concept.

2.11B

Describe how human impact can be limited through reducing, reusing, or recycling.

📘 Key Vocabulary

reduceTo use less of a resource to decrease waste reuseTo use something again instead of throwing it away recycleTo convert waste material into new usable material human impactThe effect of human actions on the natural environment limitTo control or reduce the amount of damage to the environment pollutionHarmful substances added to the environment by human activity conserveTo protect and use resources carefully to prevent waste natural resourceA material from nature that can be conserved or wasted wasteUnused or discarded material; reducing waste helps the environment environmentThe natural world that is affected by human actions

💡 Key Concepts

▸Reducing means using less of a resource — buying only what you need, turning off lights, and using both sides of paper all reduce resource consumption.
▸Reusing means using an item more than once — refilling a water bottle, using reusable shopping bags, and donating used clothes all extend the life of products.
▸Recycling converts used materials into new products — recycling aluminum cans saves 95% of the energy needed to produce new aluminum; recycling paper saves trees and water.

🍎 Teacher Guide

📌Make the reduce-reuse-recycle hierarchy explicit: reducing is better than reusing, which is better than recycling — students often think recycling is the best option, but reducing consumption at the source is most effective.
📌Conduct an audit of classroom trash for one day — sort it into "could be reduced," "could be reused," and "could be recycled" categories — this concrete data makes conservation personally meaningful.
📌Connect to the water cycle and natural systems: pollution enters waterways and ecosystems, affecting organisms students know from food chains — the system-thinking connection builds understanding of how human actions ripple through the natural world.

2.12A

Describe how physical characteristics of environments support plants and animals.

📘 Key Vocabulary

environmentAll the living and nonliving things surrounding an organism physical characteristicA measurable feature of an environment such as temperature and rainfall temperatureA measure of how hot or cold an environment is rainfallThe amount of precipitation an environment receives lightThe amount of sunlight available in an environment habitatThe place where an organism lives and finds what it needs supportTo provide the conditions an organism needs to survive distributeHow organisms are spread across an environment organismA living thing whose survival depends on its environment describeTo explain how physical features of an environment affect organisms

💡 Key Concepts

▸Physical characteristics of environments — temperature, precipitation, soil type, and light availability — determine which organisms can survive there.
▸Desert environments have extreme heat and very little water — organisms that live there have adaptations for conserving water and tolerating high temperatures.
▸Temperate forests have moderate temperatures, reliable rainfall, and rich soil — these physical characteristics support diverse communities of plants and animals.

🍎 Teacher Guide

📌Use a virtual or physical "biome box" containing photos and artifacts representing different environments (desert cactus spine, rainforest leaf, tundra lichen photo, coral reef shell) — students compare physical characteristics and predict what animals could live there.
📌Focus on cause and effect: "The desert gets very little rainfall — what kinds of plants would be able to live there? What physical characteristic of the desert determines this?" — this causal reasoning is the heart of the standard.
📌Texas has distinct ecosystems — Piney Woods, Hill Country, Chihuahuan Desert, Gulf Coast — use local examples so students are learning about environments they might visit, building identity and stewardship.

2.12B

Create and describe food chains identifying producers and consumers.

📘 Key Vocabulary

food chainA sequence showing how energy passes from producers to consumers producerAn organism that makes its own food using sunlight consumerAn organism that eats producers or other consumers for energy herbivoreA consumer that eats only plants carnivoreA consumer that eats only animals omnivoreA consumer that eats both plants and animals energyWhat passes from one organism to the next in a food chain createTo draw or describe a food chain showing producers and consumers identifyTo name each organism's role in a food chain describeTo explain how energy moves through a food chain

💡 Key Concepts

▸A food chain is a sequence showing how energy flows from producers to consumers — grass → grasshopper → frog → snake → hawk shows five levels of energy transfer.
▸Producers use sunlight to make food (photosynthesis); primary consumers eat producers; secondary consumers eat primary consumers — each level transfers energy from the previous level.
▸The food chain begins with the Sun — all energy in a food chain originally came from sunlight captured by producers, making the Sun the ultimate energy source for most ecosystems.

🍎 Teacher Guide

📌Use real Texas food chains as the content: live oak → deer → mountain lion (Hill Country) or seagrass → sea turtle → shark (Gulf Coast) — regional relevance makes the content more engaging and connects classroom learning to the state.
📌Have students physically act out the food chain — one student is the sun, one is the plant, one is the grasshopper, one is the frog — passing a "sun energy token" from person to person shows energy flow concretely.
📌Introduce the terms producer and consumer explicitly at Grade 2 and require students to use them in their explanations — vocabulary precision at this grade level prepares students for the more sophisticated food web work in Grade 4.

2.12C

Explain how some plants depend on living things, wind, or water for pollination and seed dispersal.

📘 Key Vocabulary

pollinationThe transfer of pollen from one flower to another, enabling seed production seed dispersalThe movement of seeds away from the parent plant to new locations pollenA fine powder produced by flowers needed for plant reproduction dependTo rely on an agent to accomplish pollination or seed dispersal windA natural force that can carry pollen and seeds over long distances waterA natural force that can carry seeds to new locations insectAn animal such as a bee that transfers pollen between flowers birdAn animal that eats fruit and disperses seeds through digestion reproductionThe process by which plants make seeds to create offspring explainTo describe how each agent helps plants reproduce

💡 Key Concepts

▸Pollination is the transfer of pollen between flowers — without pollination, most flowering plants cannot produce seeds or fruits, making pollinators essential for plant reproduction.
▸Pollinators — bees, butterflies, birds, bats, and even the wind — transfer pollen from one flower to another, enabling fertilization and seed production.
▸Seed dispersal moves seeds away from the parent plant — wind carries dandelion seeds; birds eat berries and deposit seeds in their droppings; water floats coconuts to new islands — this prevents competition with the parent plant.

🍎 Teacher Guide

📌Bring in a flower with visible pollen (a lily works well) and demonstrate how pollen transfers from the stamen to the pistil using a small paintbrush, simulating what a bee's body does — making the mechanism concrete.
📌Show seed dispersal using actual seeds: a dandelion (wind), a burr (animal fur), a berry (bird digestive dispersal), a coconut (water) — each mechanism shows how plants "solve" the problem of dispersal without moving themselves.
📌Connect pollination to food production: most fruits and vegetables students eat require pollination — asking "What would happen to our food supply if all bees disappeared?" makes the ecological importance personally relevant.

2.13A

Compare plant structures that help plants meet their needs.

📘 Key Vocabulary

structureA plant body part with a specific form and function functionThe job of a plant structure rootThe underground structure that absorbs water and anchors the plant stemThe structure that supports the plant and transports water and nutrients leafThe structure that captures sunlight for photosynthesis flowerThe reproductive structure that produces seeds fruitThe structure that contains seeds and protects them compareTo look at different plant structures and describe how they help plants survive surviveTo stay alive by getting water, nutrients, and sunlight using plant structures needWhat a plant requires to live; met by specific structures

💡 Key Concepts

▸Plant structures are specialized for specific functions — roots with root hairs increase surface area for water absorption; broad leaves maximize sunlight capture; thorns deter herbivores.
▸Comparing plant structures across species reveals how different plants meet the same needs in different ways — cacti store water in thick stems; bromeliads collect rainwater in leaf cups.
▸Understanding plant structure-function relationships helps scientists understand why plants are shaped the way they are — every feature of a plant's body has a function related to survival.

🍎 Teacher Guide

📌Dissect flowers (carnations or tulips work well) to reveal all five structures at once — examining real plant parts with hand lenses is far more effective than looking at diagrams, because the structure-function connection is visible.
📌Compare plant structures across species: a cactus stem (thick, stores water), a lily stem (thin, just transport), a strawberry runner (extends to reproduce) — variety shows that structure varies because function varies across environments.
📌Post a "Plant Structures We Know" chart that expands across the unit, adding new examples of each structure type so students see that roots, stems, leaves, flowers, and fruits appear in many forms.

2.13B

Compare animal structures/behaviors for finding food, water, and air.

📘 Key Vocabulary

structureAn animal body part with a specific form and purpose behaviorWhat an animal does in response to its environment survivalStaying alive by using structures and behaviors to meet needs foodWhat animals need for energy; structures help find and eat it waterA vital need; animal structures help locate and drink it airThe gas animals breathe; some structures like gills extract oxygen from water compareTo describe how different animals use different structures for the same need beakA bird structure shaped for eating specific types of food finA fish structure used to move and steer in water clawAn animal structure used to catch food, climb, or burrow

💡 Key Concepts

▸Animals use structures and behaviors to find and obtain food, water, and air — eagles use sharp talons and beaks to catch prey; elephants use trunks to grasp food and suck up water.
▸Structural adaptations for obtaining food are matched to the food source — a hummingbird's long, thin beak reaches nectar inside flowers; a pelican's wide beak scoops fish from water.
▸Animals also have behavioral strategies for finding resources — wolves hunt in packs to take down large prey; elephants migrate long distances to find water during dry seasons.

🍎 Teacher Guide

📌Use a comparative structure grid: rows are different animals (eagle, shark, spider, elephant), columns are needs (find food, get water, escape predators, move) — students fill in the grid with specific structures, building systematic comparison skills.
📌Focus on the diversity of solutions: many different structures can solve the same problem — eagles use talons, spiders use silk, wolves use speed, frogs use sticky tongues, all to catch food — the variety of solutions is a key insight.
📌Connect behavioral adaptations briefly without confusing them with structural ones: pointing out that some animals have both structural AND behavioral strategies (a chameleon has camouflage structure AND behavioral stillness) previews Grade 4.

2.13D

Investigate unique life cycles where young do not resemble parents, including butterflies and frogs.

📘 Key Vocabulary

life cycleThe series of stages an organism passes through from birth to death metamorphosisThe process of dramatic body change during development complete metamorphosisA life cycle with four stages: egg, larva, pupa, adult eggThe starting stage of many animal life cycles larvaThe worm-like stage of complete metamorphosis; feeding stage pupaThe resting stage of complete metamorphosis where the body reorganizes adultThe final, reproductive stage of the life cycle butterflyAn insect that undergoes complete metamorphosis frogAn amphibian that undergoes metamorphosis from tadpole to adult uniqueDifferent from the typical; these life cycles have stages that don't resemble parents

💡 Key Concepts

▸Complete metamorphosis is a life cycle with four dramatically different stages: egg → larva → pupa → adult — the caterpillar (larva) looks nothing like the butterfly (adult).
▸A frog undergoes metamorphosis from tadpole to adult — the tadpole breathes with gills and swims with a tail; the adult breathes air and walks on four legs — a dramatic transformation.
▸Metamorphosis is an adaptation that allows different life stages to use different resources — caterpillars eat leaves; butterflies drink nectar — reducing competition between young and adult.

🍎 Teacher Guide

📌Use time-lapse video of a caterpillar forming a chrysalis and emerging as a butterfly — the actual transformation is dramatic and memorable, and makes the "dramatic change" of metamorphosis viscerally real for students.
📌Compare complete and incomplete metamorphosis side by side using diagrams, emphasizing the key difference: in complete metamorphosis, the larva looks completely different from the adult; in incomplete metamorphosis, the nymph resembles a small adult.
📌Connect to the survival advantage: "Why might it be helpful for the caterpillar (larva) to eat leaves while the butterfly (adult) drinks nectar?" — guiding students to see that different life stages avoid competing with each other for the same resources.

Grade 3 · §112.5

Students measure physical properties, investigate forces and energy, model the solar system, study rapid Earth changes, food chains, fossils, and adaptations. Grade 3 TEKS contribute 4 Supporting Standards to the Grade 5 STAAR.

● 4 Supporting Standards on STAAR

📚

10 Key Vocabulary Words — Grade 3

Essential science words students encounter and use across all Grade 3 TEKS strands — includes STAAR-assessed vocabulary

gravity

A non-contact force that pulls all objects toward Earth; acts at a distance without touching

Force ★ STAAR

state of matter

The form matter takes — solid, liquid, or gas — which can change with heating or cooling

Matter ★ STAAR

fossil

The preserved remains or impression of a once-living organism found in rock

Organisms ★ STAAR

food chain

A sequence showing how energy passes from producers to consumers in an ecosystem

Organisms ★ STAAR

solar system

The Sun and the eight planets, moons, and other objects that orbit it

Earth ★ STAAR

condensation

The process by which water vapor (gas) cools and changes into liquid water droplets

Matter ★ STAAR

volcanic eruption

A rapid Earth change in which hot lava, gas, and ash burst from a volcano

Earth ★ STAAR

magnetism

A non-contact force that attracts or repels magnetic materials without touching

Force ★ STAAR

adaptation

A structure or behavior that helps an organism survive in its environment

Organisms

mass

The amount of matter in an object, measured with a balance scale in grams

Matter

Grade 3 expands tools significantly.

Tools now include metric rulers, Celsius thermometers, wind vanes, rain gauges, graduated cylinders, digital scales, hot plates, meter sticks, magnets, timing devices, terrariums, aquariums, collecting nets, computers, tablets, and cameras. Graphic organizers include tables, bar graphs, line graphs, tree maps, concept maps, Venn diagrams, flow charts, and input-output tables.

3.1

Investigations. (A) Ask questions and define problems; (B) Plan and conduct descriptive investigations; use engineering practices to design solutions; (C) Demonstrate safe practices; (D) Use expanded tool list; (E) Collect observations and measurements; (F) Construct graphic organizers; (G) Develop and use models or design a prototype.

📘 Key Vocabulary

investigationA planned study using scientific methods to answer questions descriptive investigationAn investigation that observes and records without testing a hypothesis metric rulerA tool used to measure length in centimeters and millimeters Celsius thermometerA tool used to measure temperature in degrees Celsius graduated cylinderA cylindrical tool used to measure the volume of liquids digital scaleAn electronic tool used to measure the mass of objects wind vaneA tool used to measure wind direction rain gaugeA tool used to measure the amount of precipitation dataMeasurements and observations collected during an investigation graphic organizerA visual tool such as a bar graph or Venn diagram used to organize data

💡 Key Concepts

▸Grade 3 introduces metric tools — metric rulers measure length in centimeters, Celsius thermometers measure temperature, graduated cylinders measure liquid volume, and digital scales measure mass — using correct units is essential.
▸Graphic organizers (bar graphs, Venn diagrams, flow charts) are used to organize data so patterns and relationships are easy to identify — the choice of organizer depends on the type of data collected.
▸Designing a prototype means creating an early test model of a solution — it does not need to be perfect; the purpose is to test the design and make improvements.

3.2

Data Analysis. (A) Identify advantages and limitations of models such as their size, scale, properties, and materials; (B) Analyze data by identifying significant features, patterns, or sources of error; (C) Use mathematical calculations to compare patterns and relationships; (D) Evaluate a design or object using criteria.

📘 Key Vocabulary

dataObservations and measurements collected and analyzed to find patterns patternA repeated or predictable arrangement found in data analyzeTo carefully examine data to identify features and relationships modelA representation of an object, process, or system limitationA weakness in a model that makes it less than perfectly accurate scaleThe proportion of a model compared to the real object source of errorSomething that could cause inaccurate data in an investigation mathematical calculationUsing numbers and operations to find relationships in data criteriaStandards used to judge whether a design or model works as intended evaluateTo judge the quality or accuracy of data, a model, or a design

💡 Key Concepts

▸Analyzing data at Grade 3 includes identifying sources of error — if a scale is not zeroed before use, all mass measurements will be off by the same amount, which is a systematic error.
▸Mathematical calculations like finding average, difference, or ratio help compare patterns in data — 'The average temperature in July was 95°F compared to 45°F in January' reveals a 50°F seasonal difference.
▸Evaluating a design means comparing it to the criteria and constraints — if the criteria was to hold 2 liters of water and the prototype leaks, the design needs improvement.

3.3

Explanations & Communication. (A) Develop explanations and propose solutions; (B) Communicate individually and collaboratively; (C) Listen actively to identify relevant evidence and engage respectfully.

📘 Key Vocabulary

explanationA statement that uses evidence to describe why or how something happens evidenceData and observations that support an explanation solutionA plan or answer to a problem that is supported by evidence communicateTo share scientific findings with others in a clear way collaborateTo work together with others toward a shared scientific goal scientific argumentationA respectful exchange of claims and evidence to reach conclusions conclusionA judgment based on evidence and reasoning proposalA suggestion for a solution or course of action relevant evidenceData that directly relates to and supports a claim formatThe method or structure used to present scientific information

💡 Key Concepts

▸At Grade 3, scientific explanations connect evidence from investigations to well-established scientific principles — 'The ice melted faster in warm water because heat transfers from the warm water to the cold ice.'
▸Proposing a solution means using evidence and models to suggest how a problem can be solved — the proposal must be logical, based on data, and consistent with scientific principles.
▸Scientific argumentation at Grade 3 means identifying relevant evidence from multiple sources and using it to defend or challenge claims — not all evidence is equally relevant to every claim.

3.4

Scientists & Society. (A) Explain how scientific discoveries and innovative solutions impact science and society; (B) Research and explore resources to investigate STEM careers.

📘 Key Vocabulary

STEM careerA job in science, technology, engineering, or mathematics scientistA person who investigates questions about the natural world engineerA person who uses science and math to design solutions discoveryA new finding that adds to our understanding of the natural world innovationA new idea or method that improves something or solves a problem societyA community of people that benefits from scientific discoveries impactThe effect a discovery or innovation has on people and the environment resourceA tool, place, or person used to investigate science careers mentorAn experienced person in a STEM field who guides others researchA careful investigation to discover new scientific knowledge

💡 Key Concepts

▸Scientific discoveries have changed society — the discovery that germs cause disease led to the development of vaccines, antibiotics, and handwashing practices that save millions of lives.
▸STEM careers include scientists, engineers, mathematicians, and technologists — exploring museums, online platforms, and meeting STEM professionals helps students envision future careers.
▸Every STEM career requires both content knowledge and the practice of science — regardless of specialty, scientists ask questions, collect data, analyze results, and communicate findings.

3.5A

Patterns: Identify and use patterns to explain scientific phenomena or to design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable way cycleA pattern that keeps repeating, such as the water cycle or life cycle solar systemA system with patterns of planetary motion around the Sun planetAn object in a pattern of orbital motion around the Sun food chainA pattern of energy transfer from producers to consumers seasonA repeating pattern of weather changes throughout the year orbitThe predictable repeated path of a planet or moon predictTo say what will happen next by recognizing a pattern sequenceThe order of events in a repeating cycle describeTo explain the characteristics of a repeating pattern

💡 Key Concepts

▸Patterns in Earth science include the rock cycle (igneous → sedimentary → metamorphic), the water cycle (evaporation → condensation → precipitation), and the seasons — all are predictable, repeating patterns.
▸Patterns in life science include food chains (energy always flows from producers to consumers), life cycles (every organism passes through similar stages), and migration (animals return to the same locations each year).
▸Using patterns to design solutions means applying knowledge of repeating cycles — engineers use rainfall patterns to design reservoirs; farmers use growing season patterns to plan planting schedules.

3.5B

Cause & Effect: Identify and investigate cause-and-effect relationships to explain scientific phenomena or analyze problems.

📘 Key Vocabulary

causeThe reason something happens effectThe result or outcome of a cause forceA push or pull; forces cause changes in motion gravityThe force that causes objects to fall toward Earth eruptionWhat happens when magma is forced out of a volcano by pressure earthquakeGround shaking caused by movement of tectonic plates heatingAdding thermal energy; causes state changes and other effects coolingRemoving thermal energy; causes state changes and other effects investigateTo explore carefully to find the cause of an event relationshipThe connection between what causes something and what results

💡 Key Concepts

▸Forces cause changes in motion — gravity (cause) makes objects fall (effect); friction (cause) slows moving objects (effect); a push (cause) starts motion (effect).
▸In ecosystems, cause-and-effect chains can be complex — removing a predator (cause) causes prey to overpopulate (effect), which causes overgrazing (effect), which causes soil erosion (effect).
▸Understanding cause-and-effect in Earth science: a volcanic eruption (cause) deposits new rock and ash (effect), which weathers over time (effect) into new soil (effect) — one cause creates a chain of effects.

3.5C

Scale: Use scale, proportion, and quantity to describe, compare, or model different systems.

📘 Key Vocabulary

scaleThe size of a model compared to the real object proportionThe relationship between the sizes of different parts solar system modelA scaled representation of planets and their distances from the Sun compareTo describe how systems differ in size or quantity quantityThe number or amount of something in a system modelA scaled representation that shows a system or process measureTo find the actual size of something using a measuring tool relative sizeThe size of something compared to another object systemA group of interacting parts that can be modeled at different scales describeTo explain scale relationships in a scientific model

💡 Key Concepts

▸Scale helps scientists compare sizes and distances that are hard to visualize — the Sun is 109 times wider than Earth, and Earth is 4 times wider than the Moon — understanding these proportions is essential.
▸Scale models represent real objects at a manageable size — a scale model of the solar system must maintain the correct proportional distances between planets, even if actual distances must be reduced by billions.
▸Quantity affects systems — adding more water to a soil sample increases its mass proportionally; doubling the force on an object doubles its acceleration — scale and quantity directly affect scientific outcomes.

3.5D

Systems: Examine and model the parts of a system and their interdependence in the function of the system.

📘 Key Vocabulary

systemA group of parts that work together as a whole food chainA system of energy transfer between organisms solar systemA system consisting of the Sun, planets, moons, and other objects ecosystemA system of living and nonliving things interacting interdependenceWhen parts of a system rely on each other to function modelA representation of a system and how its parts are connected functionThe job a part performs within a system interactWhen parts of a system affect each other partA single component that contributes to the function of a whole system examineTo look carefully at how system parts work together

💡 Key Concepts

▸A food chain is a system — producers, primary consumers, secondary consumers, and decomposers are all interdependent parts; removing one part disrupts the entire system.
▸Earth's solar system is a system — the Sun, planets, moons, and asteroids interact through gravity; each planet's orbit depends on the gravitational pull of the Sun.
▸An ecosystem is a complex system — living organisms (biotic) interact with nonliving factors (abiotic) in a web of interdependencies; changing one component affects all others.

3.5E

Energy & Matter: Investigate the flow of energy and cycling of matter through systems.

📘 Key Vocabulary

energyThe ability to do work or cause change matterAnything that has mass and takes up space flowThe movement of energy from one place or organism to another cycleThe repeated movement of matter through a system food chainA system showing how energy flows from producers to consumers state changeA change in matter caused by adding or removing thermal energy thermal energyThe energy of moving particles; causes changes in state investigateTo explore how energy flows and matter cycles through systems conserveTo keep the same total amount even as energy and matter change form transformTo change from one form to another; energy transforms in food chains

💡 Key Concepts

▸In food chains, energy flows from the Sun through producers to consumers — at each level, some energy is lost as heat; the remaining energy passes to the next consumer.
▸Matter cycles through ecosystems — carbon, nitrogen, and water are continuously recycled between living organisms and the nonliving environment, never truly disappearing.
▸State changes involve both matter and energy — adding thermal energy to ice (matter) causes it to change state to liquid water; the matter is conserved but its form changes.

3.5F

Structure & Function: Explain the relationship between the structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA body part or physical feature with a specific form functionThe job or purpose of a structure adaptationA structure or behavior that helps an organism survive in its environment giraffeAn animal whose long neck structure allows it to reach tall trees webbed feetA duck's structure that helps it swim through water beakA bird structure shaped for a specific type of food finsFish structures used for steering and balance in water fossilA preserved structure that shows the form of an ancient organism relationshipThe connection between how a structure looks and what it does surviveTo stay alive; structures help organisms meet their survival needs

💡 Key Concepts

▸Animal adaptations show structure-function relationships — a giraffe's long neck (structure) allows it to reach leaves at the tops of trees that other animals cannot access (function).
▸Fossils preserve the structures of ancient organisms — by studying fossil structures, paleontologists can infer the functions of body parts and how ancient organisms lived.
▸The structure-function relationship in Earth science: the layered structure of sedimentary rock (structure) preserves a record of past environments and organisms (function) over millions of years.

3.5G

Stability & Change: Explain how factors or conditions impact stability and change in objects, organisms, and systems.

📘 Key Vocabulary

stableRemaining the same; not undergoing change changeBecoming different from before ecosystemA system that can be stable or change based on environmental conditions rapid changeA sudden change such as a volcanic eruption or earthquake slow changeA gradual change such as weathering or erosion over long periods factorA condition that affects whether something changes or stays the same droughtA period of little or no rainfall that can cause ecosystem change floodAn overflow of water that can cause rapid changes in ecosystems predictTo say how a change in conditions will affect a system stabilityThe state of remaining unchanged under normal conditions

💡 Key Concepts

▸Rapid changes like volcanic eruptions and earthquakes dramatically alter Earth's surface in hours or days — these sudden changes disrupt stable ecosystems and can cause extinction of local populations.
▸Slow, gradual changes like weathering and erosion reshape Earth's surface over thousands to millions of years — these changes are also constant and continuous, just imperceptible on short time scales.
▸Ecosystems can recover from disturbance if conditions return to normal — after a wildfire, pioneer plants colonize the burned area, eventually restoring stability to the ecosystem through a process called succession.

3.6A

Measure, test, and record physical properties of matter, including temperature, mass, magnetism, and the ability to sink or float in water.

📘 Key Vocabulary

physical propertyA measurable or observable characteristic of matter temperatureA property of matter measured with a thermometer massThe amount of matter in an object, measured with a balance magnetismA property of some materials that are attracted to a magnet densityA property determined by comparing an object's mass to its volume sinkTo fall to the bottom of a liquid; denser objects sink in water floatTo stay on the surface of a liquid; less dense objects float in water measureTo find the value of a physical property using a tool testTo investigate a property using a controlled procedure recordTo write down the measurements of physical properties

💡 Key Concepts

▸Physical properties of matter can be measured — mass is measured with a balance in grams; temperature with a thermometer in Celsius; and volume with a graduated cylinder in milliliters.
▸Magnetism is a physical property — materials that are attracted to a magnet (iron, nickel, cobalt) are magnetic; materials that are not attracted (plastic, wood, glass) are non-magnetic.
▸Density determines whether an object sinks or floats — objects less dense than water (density < 1 g/cm³) float; objects more dense than water (density > 1 g/cm³) sink — this is relative density.

🍎 Teacher Guide

📌Run a property testing lab where students receive four unknown materials and systematically test each for temperature, mass, magnetism, and sinking/floating — recording results in a data table before identifying the materials — teaching the practice of multi-property identification.
📌Emphasize that density (expressed as sinking/floating) is a property, not just an observation — ask "Why does the wood float and the metal sink if the metal chunk is smaller?" to surface the misconception that mass alone determines floating.
📌Connect the property of magnetism to real-world applications: recycling centers use powerful electromagnets to separate ferrous metals from other waste — this application grounds the abstract property in a practical engineering context.

3.6B

Describe and classify samples of matter as solids, liquids, and gases and demonstrate that solids have a definite shape and liquids and gases take the shape of their container.

📘 Key Vocabulary

solidA state of matter with a definite shape and volume liquidA state of matter that flows and takes the shape of its container gasA state of matter with no definite shape or volume that fills its container definite shapeA shape that stays the same; characteristic of solids volumeThe amount of space matter occupies containerThe vessel that determines the shape of a liquid or gas particleThe tiny units that make up matter and move differently in each state classifyTo sort matter into solid, liquid, or gas based on properties describeTo explain the characteristics of each state of matter demonstrateTo show that solids keep their shape while liquids and gases do not

💡 Key Concepts

▸Matter exists in three states: solid (definite shape and volume), liquid (definite volume but takes container's shape), and gas (no definite shape or volume — expands to fill any space).
▸The state of matter is determined by the energy of its particles — in solids, particles vibrate in fixed positions; in liquids, particles flow past each other; in gases, particles move rapidly and spread out.
▸The same substance can exist in all three states — water is ice (solid), liquid water, or steam (gas) depending on temperature — the substance is always H₂O regardless of state.

🍎 Teacher Guide

📌Use the particle model of matter informally at Grade 3: "In a solid, the tiny particles are packed tightly and can't move around; in a liquid, they can slide past each other; in a gas, they spread out and move freely" — this model makes the observable differences between states explainable.
📌Provide containers of three different shapes and have students pour the same liquid into each, drawing what it looks like in each container before and after — this confirms that liquids take the shape of their container and establishes the observation concretely.
📌Avoid the common misconception that gases are weightless: blow air into a balloon and show that it gains mass (use a sensitive balance) — this demonstrates that gas is matter and challenges the intuition that air has no mass.

3.6C

Predict, observe, and record changes in the state of matter caused by heating or cooling in a variety of substances such as ice becoming liquid water, condensation forming on the outside of a glass, or liquid water being heated to become water vapor (gas).

● Supporting

📘 Key Vocabulary

state of matterThe form matter takes — solid, liquid, or gas heatingAdding thermal energy, which causes matter to change to a higher-energy state coolingRemoving thermal energy, which causes matter to change to a lower-energy state meltingThe change from solid to liquid when heat is added freezingThe change from liquid to solid when heat is removed evaporationThe change from liquid to gas when heat is added condensationThe change from gas to liquid when heat is removed water vaporThe gaseous state of water; water in gas form predictTo state what change will occur when a substance is heated or cooled observeTo watch and record the changes in state that occur

💡 Key Concepts

▸Heating causes matter to change from a lower-energy state to a higher-energy state — adding heat to ice causes melting (solid → liquid); adding more heat causes evaporation (liquid → gas).
▸Cooling causes matter to change from a higher-energy state to a lower-energy state — cooling steam causes condensation (gas → liquid); further cooling causes freezing (liquid → solid).
▸Condensation is visible evidence of a gas changing to liquid — water vapor in warm air contacts a cold surface (like a glass of ice water), loses energy, and condenses into visible liquid droplets.

🍎 Teacher Guide

📌Use the water cycle as a real-world context that illustrates all three state change directions at once: evaporation (liquid→gas), condensation (gas→liquid), and precipitation/freezing (liquid→solid) — connecting 3.6C to Earth science builds coherent knowledge.
📌Have students predict what state of matter water will be at different temperatures on a number line: -20°C (solid), 20°C (liquid), 120°C (gas) — then discuss that different substances have different melting and boiling points, extending beyond just water.
📌Use the condensation on a cold glass as an anchor phenomenon for the entire unit — return to it repeatedly, asking students to explain what happened using increasingly sophisticated vocabulary as the unit progresses.

⭐ STAAR Practice — 3.6C — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.6C

A student takes an ice cube out of the freezer and places it on a plate. After a few minutes, the ice cube turns into liquid water. What caused this change?

AHeat from the room was added to the ice, causing it to change from a solid to a liquid.
BThe ice cube absorbed cold air and became heavier, which made it melt.
CThe plate removed energy from the ice, causing it to change state.
DThe ice cube changed color because of the light in the room.

Meets Grade Level TEKS 3.6C

A student notices water droplets forming on the outside of a cold glass on a warm day. Which best describes the state change that occurred and what caused it?

AWater vapor in the warm air lost energy when it touched the cold glass, changing from a gas to a liquid.
BLiquid water passed through the glass from the inside to the outside.
CThe cold glass caused the surrounding air to freeze, forming ice that melted into droplets.
DWater vapor gained energy from the cold glass and changed from a liquid to a gas.

Masters Grade Level TEKS 3.6C

A scientist heats liquid water in a beaker. She observes bubbles and steam rising from the water. She then holds a cold mirror above the beaker and water droplets form on the mirror. Which sequence of state changes did the water undergo?

ALiquid → gas (evaporation from heating), then gas → liquid (condensation on the cold mirror).
BLiquid → solid (freezing from heating), then solid → gas (sublimation on the mirror).
CGas → liquid (condensation from heating), then liquid → solid (freezing on the mirror).
DSolid → liquid (melting from heating), then liquid → solid (freezing on the mirror).

3.6D

Demonstrate that materials can be combined based on their physical properties to create or modify objects and justify the selection of materials based on their physical properties.

📘 Key Vocabulary

physical propertyA characteristic of matter used to determine its suitability for a purpose materialThe substance used to build or create an object combineTo join materials together to create or modify an object justifyTo give a reason why a specific material was chosen based on its properties strengthA property of materials describing resistance to being broken flexibilityA property describing the ability to bend without breaking waterproofA property describing resistance to water passing through a material conductThe ability of a material to transfer heat or electricity insulateThe ability of a material to prevent the transfer of heat or electricity designTo plan how materials with specific properties will be used to solve a problem

💡 Key Concepts

▸Selecting materials for a design requires understanding their physical properties — a waterproof material is chosen for rain protection; a flexible material for a hinge; a strong material for a load-bearing structure.
▸Materials can be combined to create objects with desired properties — concrete (strong, rigid) and steel rebar (strong, flexible) are combined to make reinforced concrete that resists both compression and tension.
▸Justifying a material selection means explaining why its specific physical properties make it the best choice for the intended purpose — the explanation connects the property to the function.

🍎 Teacher Guide

📌Design a materials selection challenge: students must build a bridge from index cards that holds the most pennies — they must select and justify the design based on physical properties of the materials available to them.
📌Create a properties reference chart before the design challenge: list each material and its properties — then students can look up "strong? flexible? waterproof?" as they design, modeling how engineers use material data sheets.
📌Debrief after testing by asking "Which material choice made the biggest difference? Why?" — helping students connect their design decisions to the physical properties that determined the outcome.

3.7A

Demonstrate and describe forces acting on an object in contact or at a distance, including magnetism, gravity, and pushes and pulls.

● Supporting

📘 Key Vocabulary

forceA push or pull that can act on an object at contact or at a distance contact forceA force that requires physical touching between objects non-contact forceA force that acts at a distance without touching gravityA non-contact force that pulls all objects toward Earth magnetismA non-contact force that attracts or repels magnetic materials pushA contact force that moves an object away from the source pullA contact or non-contact force that moves an object toward the source demonstrateTo show through action how a force affects an object describeTo explain what kind of force is acting on an object distanceThe space between objects; non-contact forces act across a distance

💡 Key Concepts

▸Forces can act at a distance (non-contact) without touching — gravity pulls objects toward Earth without contact; magnets attract iron objects without touching them.
▸Forces can also act through contact — a push from your hand, friction from the floor, and the normal force of a surface on a resting object all require physical contact.
▸Multiple forces can act on an object at the same time — a book resting on a table experiences gravity pulling down AND the table's normal force pushing up — these forces balance each other.

🍎 Teacher Guide

📌Use a force classification game as the entry point: show 15 images of forces in action and have students sort them into "Contact" and "Non-contact" before any instruction — surface prior knowledge and misconceptions before teaching.
📌Make gravity a non-contact force explicit — students often think gravity requires the object to be on the ground; dropping objects from height and demonstrating that gravity acts before the object hits the ground corrects this misconception.
📌Connect to STAAR practice: the STAAR often presents scenarios describing a force situation and asks students to identify the type — give students practice identifying forces in written scenarios (not just pictures) at Grade 3.

⭐ STAAR Practice — 3.7A — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.7A

A student drops a ball from her hand. The ball falls to the ground. Which force caused the ball to fall?

AGravity pulled the ball downward toward Earth.
BMagnetism pulled the ball toward the metal floor.
CThe student's push sent the ball downward.
DFriction slowed the ball and caused it to drop.

Meets Grade Level TEKS 3.7A

A student places a steel paperclip on a table. She moves a magnet toward the clip without touching it, and the clip slides toward the magnet. What type of force is acting on the paperclip?

AA non-contact force — magnetism attracted the steel clip across a distance without touching it.
BA contact force — the magnet touched the air, which pushed the clip.
CGravity — the magnet's weight pulled the clip across the table.
DFriction — the magnet created friction that moved the clip.

Masters Grade Level TEKS 3.7A

A student tests four situations: (1) She pushes a book across a desk. (2) A ball falls after being dropped. (3) A magnet pulls an iron nail without touching it. (4) She kicks a soccer ball. Which correctly classifies all four forces as contact or non-contact?

A(1) Contact, (2) Non-contact (gravity), (3) Non-contact (magnetism), (4) Contact
B(1) Non-contact, (2) Contact, (3) Non-contact, (4) Non-contact
CAll four are contact forces because objects are involved in each situation.
D(1) Contact, (2) Contact, (3) Contact, (4) Non-contact

3.7B

Plan and conduct a descriptive investigation to demonstrate and explain how position and motion can be changed by pushing and pulling objects such as swings, balls, and wagons.

● Supporting

📘 Key Vocabulary

positionWhere an object is located relative to another object motionThe act of moving; a change in an object's position over time pushA force that changes position and motion by moving an object away pullA force that changes position and motion by moving an object closer swingAn object whose motion is changed by pushing and pulling wagonAn object whose direction and speed change with pushes and pulls descriptive investigationAn observation-based study of how force changes motion planTo organize the steps of an investigation before beginning conductTo carry out an investigation following a plan demonstrateTo show through evidence how pushes and pulls change motion

💡 Key Concepts

▸A push or pull can change an object's position (where it is) and motion (how it is moving) — pushing a wagon (pull) changes both its position and the direction it moves.
▸The direction of a force determines the direction of motion — pushing north makes an object move north; pulling east makes it move east; a sideways push on a moving object changes its direction.
▸A descriptive investigation of forces records what happens when different pushes and pulls are applied — comparing results shows the relationship between force direction, strength, and the resulting change in motion.

🍎 Teacher Guide

📌Design the investigation around a ball on a ramp system — students can control the push strength, the direction of push, and the angle of the ramp — ensuring multiple variables are available for testing.
📌Require a written prediction before each trial: "I predict that pushing [direction] will cause the ball to [predicted motion change] because..." — the "because" forces students to reason from what they know about forces.
📌Use video analysis if technology is available: recording the ball's motion and reviewing it frame-by-frame makes the relationship between force direction and motion direction visually clear, especially for direction changes that happen quickly.

⭐ STAAR Practice — 3.7B — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.7B

A student gives a toy car a gentle push. The car rolls slowly across the floor. She then gives the car a stronger push. What will most likely happen?

AThe car will roll faster and farther because the stronger push gave it more force.
BThe car will stop sooner because too much force cancels the motion.
CThe car will roll at the same speed because the floor creates equal friction.
DThe car will roll in the opposite direction because of the stronger push.

Meets Grade Level TEKS 3.7B

A student pulls a wagon forward. Then she pulls the wagon to the left. Which aspect of the wagon's motion changed when she pulled it to the left?

AThe direction of the wagon's motion changed because a pull in a new direction changes where the object moves.
BThe speed increased because pulling sideways always makes an object faster.
CThe wagon stopped completely because sideways pulling cancels forward motion.
DThe position of the wagon did not change because it was already moving.

Masters Grade Level TEKS 3.7B

A student investigates how pushes and pulls change motion. She places balls of the same size but different masses on a ramp and applies the same push to each. Her data shows lighter balls travel farther. What conclusion is best supported?

AThe same push force produces a greater change in motion for lighter objects than for heavier objects.
BHeavier balls travel farther because their mass helps carry the force.
CThe investigation is invalid because different masses cannot be compared with the same force.
DThe ramp angle caused the difference in distance, not the mass of the balls.

3.8A

Identify everyday examples of energy, including light, sound, thermal, and mechanical.

📘 Key Vocabulary

energyThe ability to cause change or do work lightA form of energy that travels in waves and allows us to see soundA form of energy that travels as vibrations through matter thermal energyThe energy of moving particles in a substance; felt as heat mechanical energyThe energy of motion or position of an object identifyTo name the form of energy present in an everyday example everydayRelating to normal daily life; forms of energy are all around us formThe type an energy takes, such as light, sound, heat, or mechanical exampleA specific case showing that a form of energy is present observeTo notice evidence of energy forms in the environment

💡 Key Concepts

▸Energy exists in many forms that can be identified in everyday life — a campfire produces light energy and thermal (heat) energy; a ringing bell produces sound energy; a rolling ball has mechanical (kinetic) energy.
▸The same event often involves multiple forms of energy — a car engine converts chemical energy to mechanical energy and thermal energy simultaneously.
▸Identifying forms of energy requires observing their effects — light is visible; sound can be heard; heat can be felt; mechanical energy is seen as motion.

🍎 Teacher Guide

📌Build a class "Energy Walk" around the school — students carry clipboards and identify examples of each form of energy (light from windows, sound from the gym, thermal from the cafeteria, mechanical from a moving cart) — grounding the content in the real environment.
📌Use the fact that energy forms can transform: the microwave oven uses electrical energy → thermal energy (heat) → heat the food — identifying these transformations in familiar appliances shows that energy forms are connected.
📌Avoid confusing energy with matter — a candle flame is not energy; the flame releases light energy and thermal energy as the wax (matter) burns — precision about what IS the energy vs. what CARRIES the energy prevents a common misconception.

3.8B

Plan and conduct investigations that demonstrate how the speed of an object is related to its mechanical energy.

📘 Key Vocabulary

speedHow fast an object moves; related to its mechanical energy mechanical energyThe energy of motion; objects have more when moving faster kinetic energyThe energy an object has because it is moving potential energyStored energy that an object has due to its position investigateTo plan and conduct a test to find the relationship between speed and energy relationshipThe connection between an object's speed and its mechanical energy rampA surface that can be used to change the speed of an object collisionWhen a moving object strikes another object, transferring mechanical energy transferTo move energy from one object to another during a collision demonstrateTo show how the speed of an object relates to its mechanical energy

💡 Key Concepts

▸Mechanical energy includes both kinetic energy (energy of motion) and potential energy (stored energy due to position) — a ball at the top of a ramp has potential energy; rolling down, it has kinetic energy.
▸The faster an object moves, the more kinetic (mechanical) energy it has — a ball rolling at 10 mph has more mechanical energy than the same ball rolling at 2 mph.
▸When a moving object collides with another, mechanical energy is transferred — the first object slows (loses energy) while the second object starts moving (gains energy) — energy is conserved.

🍎 Teacher Guide

📌Use the ramp-and-ball investigation: students vary the ramp height and measure how far the ball travels after leaving the ramp — they discover that greater height (more potential energy) produces greater speed (more kinetic energy) and more travel distance.
📌Introduce the collision test as a demonstration of mechanical energy transfer: a fast-moving ball hits a stationary ball — the stationary ball moves, showing that kinetic energy was transferred during the collision.
📌Connect to real-world safety: why do speed limits exist? A car moving at 60 mph has more mechanical energy than one at 30 mph — the greater energy means greater damage in a collision — this application makes mechanical energy personally relevant.

3.9A

Construct models and explain the orbits of the Sun, Earth, and Moon in relation to each other.

📘 Key Vocabulary

orbitThe path one object takes as it travels around another object SunThe star at the center of our solar system around which Earth orbits EarthThe third planet from the Sun; orbits the Sun and has the Moon orbiting it MoonEarth's natural satellite that orbits Earth revolutionThe movement of one object around another; Earth revolves around the Sun rotationSpinning around an axis; Earth rotates, causing day and night solar systemThe Sun and all the objects held by its gravity gravityThe force that keeps planets in orbit around the Sun modelA representation used to show the orbits of the Sun, Earth, and Moon constructTo build or create a model of the orbits of the Sun, Earth, and Moon

💡 Key Concepts

▸The Moon orbits Earth — it completes one full orbit approximately every 29.5 days, which is why we see changing Moon phases over the course of a month.
▸Earth orbits the Sun — it takes approximately 365.25 days (one year) to complete one orbit; Earth's tilt during this orbit causes the seasons.
▸The Sun, Earth, and Moon are in constant motion relative to each other — the alignment of all three produces special events like solar and lunar eclipses.

🍎 Teacher Guide

📌Use a kinesthetic model: designate one student as the Sun (hold a flashlight), one as the Earth (turn slowly), and one as the Moon (walk around Earth) — physical movement makes the orbital relationships memorable and distinguishes rotation (Earth turns) from revolution (Earth moves around Sun).
📌Address the scale misconception explicitly: in the model, the student playing the Sun is the same size as the student playing Earth — in reality, the Sun is 109 times larger than Earth; scale models help but must be accompanied by explicit discussion of what the model gets wrong.
📌Connect to seasons (covered in Grade 4): Earth's orbit and tilt (not distance from the Sun) cause seasons — planting this connection at Grade 3 helps students build toward the full explanation in Grade 4.

3.9B

Identify the order of the planets in Earth's solar system in relation to the Sun.

● Supporting

📘 Key Vocabulary

solar systemThe Sun and the eight planets, moons, and other objects in orbit around it planetA large body in space that orbits the Sun orbitThe path a planet travels around the Sun SunThe star at the center of our solar system orderThe sequence of planets from closest to farthest from the Sun MercuryThe first planet; closest to the Sun VenusThe second planet from the Sun MarsThe fourth planet from the Sun; a red rocky planet JupiterThe fifth and largest planet; a gas giant identifyTo name and sequence the planets in order from the Sun

💡 Key Concepts

▸The solar system contains eight planets orbiting the Sun in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune — a helpful mnemonic: My Very Excellent Mother Just Served Us Nachos.
▸Planets closer to the Sun orbit faster and have shorter years — Mercury's year is only 88 Earth days; Neptune's year is 165 Earth years, because it travels a much larger orbit at slower speed.
▸The inner planets (Mercury, Venus, Earth, Mars) are small and rocky; the outer planets (Jupiter, Saturn, Uranus, Neptune) are large gas or ice giants — these are two major categories of planets.

🍎 Teacher Guide

📌Use a mnemonic every student creates for themselves: "My Very Excellent Mother Just Served Us Nachos" or a personal one — memory strategies are explicitly appropriate here since the planet order is fundamentally a knowledge-retrieval task.
📌Distinguish inner (rocky) and outer (gas giant) planets as two categories with different characteristics — this organizational structure is easier to remember than eight disconnected names, and it prepares students for deeper planetary science.
📌Connect to STAAR practice: the STAAR often uses a solar system diagram with planets numbered and asks students to identify a specific planet — practice with numbered diagrams so students are comfortable with this question format.

⭐ STAAR Practice — 3.9B — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.9B

Which planet is closest to the Sun in Earth's solar system?

AMercury — it is the first planet from the Sun.
BVenus — it is the second planet from the Sun.
CEarth — it is the third planet from the Sun.
DMars — it is the fourth planet from the Sun.

🍎 Teacher Guide

📌Use a mnemonic every student creates for themselves: "My Very Excellent Mother Just Served Us Nachos" or a personal one — memory strategies are explicitly appropriate here since the planet order is fundamentally a knowledge-retrieval task.
📌Distinguish inner (rocky) and outer (gas giant) planets as two categories with different characteristics — this organizational structure is easier to remember than eight disconnected names, and it prepares students for deeper planetary science.
📌Connect to STAAR practice: the STAAR often uses a solar system diagram with planets numbered and asks students to identify a specific planet — practice with numbered diagrams so students are comfortable with this question format.

Meets Grade Level TEKS 3.9B

A diagram shows the solar system with Earth labeled as the third planet. Which planet is correctly identified as the sixth planet from the Sun?

ASaturn — counting from the Sun: Mercury (1), Venus (2), Earth (3), Mars (4), Jupiter (5), Saturn (6).
BJupiter — Jupiter is the fifth planet from the Sun.
CUranus — Uranus is the seventh planet from the Sun.
DNeptune — Neptune is the eighth and most distant planet.

Masters Grade Level TEKS 3.9B

Mercury completes one orbit around the Sun in about 88 days. Neptune takes about 165 Earth years. Using your knowledge of the planets' order in the solar system, which best explains this difference?

AMercury is much closer to the Sun than Neptune, so its orbital path is shorter and the Sun's gravity is stronger, causing it to orbit much more quickly.
BNeptune is heavier than Mercury, which slows it down in its orbit.
CMercury is farther from the Sun so it has less distance to travel around the solar system.
DAll planets orbit at the same speed; the difference is caused only by the size of the planet.

3.10A

Compare and describe day-to-day weather in different locations at the same time, including air temperature, wind direction, and precipitation.

📘 Key Vocabulary

weatherThe current conditions of the atmosphere at a specific time and place air temperatureA measure of how hot or cold the air is wind directionThe direction from which wind is blowing, measured with a wind vane precipitationWater that falls from clouds — rain, snow, sleet, or hail compareTo look at weather in two different locations at the same time describeTo explain weather conditions using measurable properties locationA specific place where weather data is collected dataMeasurements of temperature, wind, and precipitation atmosphereThe layer of gases surrounding Earth where weather occurs wind vaneA tool used to measure the direction of wind

💡 Key Concepts

▸Weather is the current state of the atmosphere at a specific location and time — it is described by temperature, precipitation, wind direction, and cloud cover.
▸Comparing weather in different locations at the same time reveals how geography affects weather — coastal areas are often cooler in summer and warmer in winter than inland areas at the same latitude.
▸Collecting and comparing weather data across locations helps identify patterns — when one city experiences a cold front, nearby cities in the storm's path will typically experience similar weather within days.

🍎 Teacher Guide

📌Use a real-time weather comparison: on the same day, look up weather in McAllen, TX and Amarillo, TX — two Texas cities with very different weather despite both being in the same state — showing that location determines weather even within one state.
📌Build student meteorologists: assign each student a different city and have them prepare a 30-second weather report comparing today's conditions — this authentic task requires students to read, interpret, and communicate weather data.
📌Connect to technology: weather apps and the National Weather Service website are real scientific tools — teaching students to read and interpret these resources builds both scientific literacy and practical life skills.

3.10B

Investigate and explain how soils are formed by weathering of rock and by decomposition of plant and animal remains.

📘 Key Vocabulary

soilThe upper layer of Earth made of weathered rock, minerals, and organic matter weatheringThe process of breaking rock into smaller particles by water, ice, or wind decompositionThe breakdown of dead plant and animal material into organic matter organic matterMaterial from once-living organisms that enriches soil mineralA natural inorganic material that makes up rocks and soil rockThe source material for soil; broken down over time by weathering humusDark organic matter formed from decomposed plants and animals in soil particleA small piece of rock or organic matter that makes up soil formationThe process by which something is created over time investigateTo explore and explain how weathering and decomposition form soil

💡 Key Concepts

▸Soil formation takes thousands to millions of years — rocks are broken down by weathering (water, ice, wind, temperature changes) into smaller particles, and plant/animal remains decompose to add organic matter.
▸Weathering is a slow, continuous process — water seeps into rock cracks, freezes, expands, and breaks the rock apart; this is called freeze-thaw weathering.
▸Soil quality depends on the balance of mineral particles (from weathered rock) and organic matter (from decomposition) — rich topsoil has both; sandy soil lacks organic matter; clay soil lacks coarse particles.

🍎 Teacher Guide

📌Perform a weathering simulation: place sugar cubes in a jar and shake — the mechanical breakdown demonstrates how physical forces (equivalent to freeze-thaw or abrasion) break rocks into smaller pieces without changing their chemical composition.
📌Build a layered soil jar: sand at bottom, then small gravel, then finer soil, then topsoil with organic matter — allowing each layer to settle shows students the composition of soil and connects to the idea that soil forms in layers over time.
📌Connect soil formation time scale to perspective: it takes approximately 500 years to form 1 inch of topsoil — ask students "If this classroom has been here for 50 years, how much topsoil has formed?" — this scale comparison builds geological time thinking.

3.10C

Model and describe rapid changes in Earth's surface such as volcanic eruptions, earthquakes, and landslides.

● Supporting

📘 Key Vocabulary

rapid changeA sudden, dramatic change to Earth's surface volcanic eruptionA rapid Earth change when magma breaks through Earth's crust earthquakeA rapid Earth change caused by sudden movement of tectonic plates landslideA rapid Earth change when large amounts of soil and rock slide downhill lavaMolten rock that flows from a volcano during an eruption tectonic plateA large section of Earth's crust that can move and shift faultA crack in Earth's crust where tectonic plates meet and can slip modelA representation used to show how rapid Earth changes occur describeTo explain what happens to Earth's surface during a rapid change contrastTo compare rapid Earth changes with slow changes like erosion

💡 Key Concepts

▸Volcanic eruptions are rapid Earth surface changes — magma (underground molten rock) is forced to the surface as lava, which cools to form new igneous rock, dramatically reshaping the surrounding landscape.
▸Earthquakes are rapid surface changes caused by sudden movement along fault lines — the energy released travels as seismic waves that shake the ground, can crack roads, collapse buildings, and trigger tsunamis.
▸Landslides are rapid surface changes in which large amounts of soil, rock, and debris slide quickly downhill — they are triggered by heavy rainfall, earthquakes, or volcanic activity that destabilizes slopes.

🍎 Teacher Guide

📌Anchor the lesson around a local or memorable event — the 1980 eruption of Mount St. Helens, the 2011 Joplin tornado, or a recent Texas earthquake — using real events makes the content feel consequential rather than theoretical.
📌Have students build models of each rapid change (volcano from clay and baking soda/vinegar, earthquake simulation with Jell-O blocks, landslide in a bin with wet sand) — physical modeling deepens understanding of mechanism, not just outcome.
📌Connect to STAAR practice: STAAR often asks students to compare rapid and slow changes or identify which type a given scenario represents — give students practice classifying events on a slow-to-rapid continuum.

⭐ STAAR Practice — 3.10C — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.10C

Which of the following is an example of a RAPID change to Earth's surface?

AA volcanic eruption that covers a hillside with lava and ash within hours.
BWind slowly wearing down a rock over thousands of years.
CA river gradually depositing sand at its mouth over centuries.
DSoil slowly forming from decomposing leaves over decades.

Meets Grade Level TEKS 3.10C

After a heavy rainstorm, a large section of a hillside suddenly slides downward, covering the road below with mud, rocks, and trees. What type of rapid Earth change is this, and what most likely triggered it?

AA landslide — heavy rain saturated and loosened the soil, reducing friction and causing the slope to slide rapidly downhill under gravity.
BA volcanic eruption — heat from underground melted the rock, causing it to flow down as lava.
CAn earthquake — tectonic plates shifted and pushed the hillside down.
DErosion — the rain slowly removed soil particles over many months of rain.

Masters Grade Level TEKS 3.10C

A student models three rapid Earth changes: shaking a tray of sand (earthquake), pouring red-tinted water down a mound of sand (volcanic lava flow), and piling wet sand on a slope until it collapses (landslide). Which conclusion about all three events is BEST supported by these models?

AAll three events can rapidly change Earth's surface by moving large amounts of material in a short time, disrupting landscapes and ecosystems.
BOnly water causes rapid Earth changes; earthquakes and landslides are gradual processes.
CEach model represents a slow Earth change; none of them happen rapidly in real life.
DOnly volcanic eruptions can change Earth's surface; the other events only affect human structures.

3.11

Explore how humans use natural resources (A); explain why conservation is important (B); identify ways to conserve through reducing, reusing, or recycling (C).

📘 Key Vocabulary

natural resourceA material from nature that living things use renewable resourceA resource that can be naturally replenished in a short time nonrenewable resourceA resource that cannot be replaced once used conservationThe careful use and protection of natural resources reduceTo use less of a resource to prevent waste reuseTo use an item again rather than discarding it recycleTo convert used materials into new usable products human useHow people depend on natural resources for food, shelter, and energy importantHaving great value; natural resources are important to all living things identifyTo name natural resources and classify them as renewable or nonrenewable

💡 Key Concepts

▸Natural resources include renewable resources (replenished naturally, like wind, sunlight, and plants) and nonrenewable resources (formed over millions of years, like coal, oil, and natural gas).
▸Conservation means managing resource use so that resources remain available — this includes reducing consumption, reusing materials, and recycling waste back into useful products.
▸Human activities impact natural resources — overfarming depletes soil nutrients; overfishing depletes fish populations; pollution contaminates water — conservation practices protect these essential resources.

🍎 Teacher Guide

📌Use the reduce-reuse-recycle hierarchy explicitly at Grade 3 — introduce these as three different strategies with different levels of effectiveness: reducing consumption is best; reusing extends the life of products; recycling is better than waste but requires energy.
📌Have students audit their household trash for one day and classify each item — then design a plan to reduce the waste using each strategy — connecting the abstract concept to personal action.
📌Connect renewable and nonrenewable resources to Texas specifically: Texas leads the nation in both wind energy production AND oil and gas production — this dual identity makes Texas an ideal case study for the trade-offs in resource use.

3.12A

Explain how temperature and precipitation affect animal growth/behavior through migration and hibernation and plant responses through dormancy.

📘 Key Vocabulary

migrationThe seasonal movement of animals from one region to another hibernationA state of inactivity in which animals conserve energy during cold winters dormancyA state of rest in plants during cold or dry seasons temperatureA measure of heat energy in the environment; triggers migration and hibernation precipitationWater that falls from clouds; affects animal behavior and plant dormancy behaviorWhat an organism does in response to environmental conditions growthThe increase in size and development of an organism during favorable conditions seasonA period of the year with characteristic temperature and precipitation affectTo have an influence on; temperature and precipitation affect organisms explainTo describe how environmental conditions cause animal and plant responses

💡 Key Concepts

▸Animals respond to seasonal changes in temperature and precipitation through migration (moving to a better environment) or hibernation (entering a state of reduced activity to conserve energy).
▸Migration is a behavioral adaptation — Arctic terns migrate from pole to pole annually (the longest migration of any animal); monarch butterflies migrate thousands of miles between Canada and Mexico.
▸Dormancy in plants is a response to cold or dry seasons — deciduous trees drop their leaves and stop growing in winter, conserving energy and water until favorable conditions return in spring.

🍎 Teacher Guide

📌Use a migration map to show the routes of monarch butterflies through Texas — this iconic local example makes migration concrete and helps students understand that behavioral responses to seasonal change are driven by temperature and food availability.
📌Build a hibernation investigation using gummy bear-sized pieces of food hidden around the room: "You are a bear in fall — how much food do you need to store to last through winter without eating?" — this calorie-calculation activity makes the energy conservation purpose of hibernation tangible.
📌Connect dormancy to the garden: point out that trees appear dead in winter but are dormant — examining a dormant tree branch reveals buds (already formed but waiting) so students see that dormancy is active preparation, not absence of life.

3.12B

Identify and describe the flow of energy in a food chain and predict how changes in a food chain such as removal of frogs from a pond or bees from a field affect the ecosystem.

● Supporting

📘 Key Vocabulary

food chainA sequence showing how energy passes from producers to consumers energy flowThe movement of energy from one organism to the next in a food chain producerAn organism that makes its own food using sunlight consumerAn organism that eats producers or other consumers predatorAn animal that hunts and eats other animals preyAn organism that is hunted and eaten by a predator ecosystemA community of organisms and their nonliving environment predictTo say what will happen to a food chain if one organism is removed affectTo cause a change; removing organisms affects the entire food chain describeTo explain how energy flows through each step of a food chain

💡 Key Concepts

▸Energy flows in one direction through a food chain — from producers (who capture solar energy) to primary consumers to secondary consumers; it cannot flow backward.
▸Food chains are interconnected in food webs — most organisms eat more than one food source and are eaten by more than one predator; removing one organism affects multiple food chains.
▸Predicting the effects of removing an organism from a food chain requires understanding cause-and-effect — removing frogs allows insects to overpopulate; removing bees reduces pollination and plant reproduction.

🍎 Teacher Guide

📌Build food chains from real data: ask students to research one Texas ecosystem food chain and present it to the class — the variety of chains reveals the scope of energy flow patterns across different biomes.
📌Use a food chain disruption scenario as a formative assessment: present a food chain, remove one organism, and ask students to predict and explain the cascade effects — this application task reveals depth of understanding.
📌Connect to STAAR: this is a STAAR Supporting Standard — students will need to both identify food chains AND predict effects of change; give equal instructional time to both skills, as predicting change is the higher-order task.

⭐ STAAR Practice — 3.12B — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.12B

A food chain shows: Grass → Grasshopper → Frog → Snake. Where does the energy in this food chain originally come from?

AThe Sun — grass uses sunlight to make food through photosynthesis, starting the energy flow.
BThe frog — frogs are the most active animal and produce the most energy.
CThe snake — as the top consumer, the snake provides energy to everything below it.
DThe soil — soil provides nutrients that all organisms in the food chain use for energy.

Meets Grade Level TEKS 3.12B

In a pond: Algae → Small fish → Frog → Heron. Disease kills most of the frog population. What will MOST LIKELY happen to the small fish and heron populations?

ASmall fish will increase (fewer frogs eating them) and herons will decrease (less frog prey available).
BBoth small fish and herons will increase because frogs competed with both for food.
CSmall fish will decrease because frogs protected them from algae overgrowth.
DThere is no effect because herons can switch to eating only algae.

Masters Grade Level TEKS 3.12B

A field has this food chain: Flowers → Bees → Spiders → Birds. A pesticide kills most of the bee population. A student predicts: 'The flower population will grow and the bird population will decrease.' Which best evaluates this prediction?

APartially correct — bird populations will decrease (less bee prey), but flower populations may actually decrease too because bees pollinate flowers and without pollination many flowers cannot reproduce.
BCompletely correct — flowers will bloom more because nothing is eating them, and birds will decline without bees.
CCompletely incorrect — removing bees has no effect on any other organism in the food chain.
DPartially correct — flower populations will grow, but bird populations will also grow because they can find other food sources.

3.12C

Describe how natural changes to the environment such as floods and droughts cause some organisms to thrive and others to perish or move to new locations.

📘 Key Vocabulary

floodAn overflow of water that can rapidly change an ecosystem droughtA long period with little or no rainfall that stresses an ecosystem natural changeA change to the environment caused by natural events, not humans thriveTo grow well and increase in number as conditions improve perishTo die; some organisms cannot survive when conditions change relocateTo move to a new area when an environment can no longer support survival adaptTo change behavior or traits to survive in changed conditions organismA living thing affected by natural changes in its environment environmentThe surroundings that organisms depend on to survive describeTo explain how floods and droughts affect organism survival

💡 Key Concepts

▸Natural disturbances like floods and droughts change environmental conditions — some species thrive in the new conditions (opportunistic species), while others cannot survive and either move or perish.
▸Flood effects on ecosystems include: depositing nutrient-rich sediment (beneficial to plants), drowning root systems (harmful to some plants), and displacing animals from burrows and nests.
▸Drought effects include: reduced plant growth, lower water availability for all organisms, increased fire risk, and migration of animals seeking water — drought can fundamentally restructure an ecosystem.

🍎 Teacher Guide

📌Use real local event data: show the 2011 Texas drought data and ask students what happened to deer, wildflowers, and livestock during that period — connecting the science concept to a historical event students can research.
📌Introduce the concept of opportunistic species: some organisms (like certain weeds and insects) actually thrive after floods or fires because their competitors were eliminated — this nuance prevents the oversimplification that all organisms suffer equally from environmental change.
📌Have students design a food web and then simulate a drought by removing one food source — tracking all the ripple effects through the web makes cause-and-effect relationships in ecosystems visible and complex.

3.12D

Identify fossils as evidence of past living organisms and environments, including common Texas fossils.

● Supporting

📘 Key Vocabulary

fossilThe preserved remains, impression, or trace of an organism from the past preservedKept intact over a long period of time in sediment or rock sedimentary rockThe type of rock most likely to contain fossils extinctDescribing a species that no longer exists on Earth paleontologistA scientist who studies fossils to learn about ancient life evidenceWhat fossils provide about past living organisms and environments ancientVery old; relating to organisms that lived long ago Texas fossilA fossil found in Texas such as mosasaur, ammonite, or shark teeth environmentThe surroundings of ancient organisms preserved in the fossil record identifyTo name a fossil and describe what it tells us about the past

💡 Key Concepts

▸Fossils are the preserved remains, impressions, or traces of organisms that lived in the past — they form most often in sedimentary rock when organisms are buried by sediment that hardens over time.
▸Common Texas fossils include ammonites (ancient marine mollusks), mosasaur bones (large swimming reptiles), shark teeth, and sea lily (crinoid) fossils — these show that parts of Texas were once covered by shallow seas.
▸Fossils provide evidence about ancient environments — finding marine fossils in inland Texas tells scientists that the area was once covered by ocean water; fossil pollen tells scientists about ancient plant communities.

🍎 Teacher Guide

📌Take students to a local museum with fossil exhibits or arrange a virtual tour of the Texas fossil collection at UT Austin — seeing real fossils rather than just pictures of them makes the standard tangibly real.
📌Bring in actual Texas fossils if possible (shark teeth, ammonite imprints, and crinoid stems are common and inexpensive) — students who hold a fossil that came from central Texas and understand it came from an ancient sea develop a sense of deep time.
📌Connect to STAAR: STAAR questions on fossils often ask what the fossil tells us about the past environment, not just what organism it was — practice this inferential skill explicitly by showing a fossil and asking "What can you tell about where and how this organism lived?"

⭐ STAAR Practice — 3.12D — Approaches · Meets · Masters

Approaches Grade Level TEKS 3.12D

A student finds what appears to be a shell pressed into a rock. The shell is no longer there, but its detailed shape is preserved in the rock. What is this an example of?

AA fossil — the preserved impression of a once-living organism left in rock.
BA mineral crystal that grew in the shape of a shell over time.
CA rock that was shaped by water erosion to look like a shell.
DA living organism that was compressed by rock pressure.

Meets Grade Level TEKS 3.12D

Scientists find fossils of ammonites (ancient ocean animals) in the limestone hills of central Texas. What can scientists conclude from these fossils?

ACentral Texas was once covered by a shallow sea where these marine organisms lived — the fossils are evidence of a past ocean environment.
BAmmonites were land animals that happened to look like sea creatures.
CThe fossils were carried to Texas from the ocean by ancient humans.
DAmmonites currently live underground in Texas and leave their shells in the rock.

Masters Grade Level TEKS 3.12D

A scientist finds two types of evidence in Texas rock layers: (1) Body fossils of mosasaurs (large swimming reptiles) in one layer. (2) Trace fossils of large three-toed tracks in the layer above. She concludes the environment changed between the two time periods. Which conclusion is BEST supported by both pieces of evidence?

AThe lower layer was a marine environment (mosasaurs lived in oceans); the upper layer was a land environment (walking tracks indicate land animals) — the environment changed from sea to land over time.
BBoth layers represent the same ocean environment because all large animals can swim.
CThe trace fossils in the upper layer were made by mosasaurs walking on land.
DThe layers were deposited at the same time, so no environmental change occurred.

3.13A

Explore and explain how external structures and functions of animals enable them to survive in their environment.

📘 Key Vocabulary

structureA body part of an animal with a specific form functionThe job a structure performs that helps an animal survive external structureA body part visible on the outside of an organism adaptationA structure or behavior that helps an organism survive in its environment giraffeAn animal whose long neck allows it to reach leaves at the tops of tall trees webbed feetA duck's adaptation that allows efficient swimming in water camouflageA color or pattern structure that helps an organism blend into its environment clawsCurved structures used for gripping, climbing, or catching prey explainTo describe why a specific structure helps an animal survive environmentThe habitat where an animal's structures are useful for survival

💡 Key Concepts

▸External structures are body parts on the outside of an animal — fins, feathers, shells, claws, beaks, and fur are all external structures that help animals interact with their environment.
▸Structures are matched to their environment — a duck's webbed feet are suited for swimming; a woodpecker's chisel-like beak is suited for drilling into tree bark to find insects.
▸Explaining how a structure helps an animal survive requires connecting the structure's form to its specific function in the organism's habitat and lifestyle.

🍎 Teacher Guide

📌Focus on the structure-function-environment chain: look at the structure, determine its function, then infer the environment where that function is useful — a webbed foot works in water; long curved claws work for tree-climbing; this three-step reasoning is the core skill.
📌Use a mystery animal challenge: show only one body structure at a time (a foot, then a beak, then a wing) and have students revise their prediction of what the animal is with each new structure revealed — building inference skills.
📌Connect to fossil evidence: paleontologists use the same structure-function reasoning to understand extinct animals — a long neck fossil suggests tall vegetation; sharp fossil teeth suggest a carnivore — this application builds appreciation for structural analysis.

3.13B

Explore, illustrate, and compare life cycles in organisms such as beetles, crickets, radishes, or lima beans.

📘 Key Vocabulary

life cycleThe series of stages an organism passes through from birth to death incomplete metamorphosisA life cycle with three stages: egg, nymph, adult complete metamorphosisA life cycle with four stages: egg, larva, pupa, adult beetleAn insect that undergoes complete metamorphosis cricketAn insect that undergoes incomplete metamorphosis radishA plant with a life cycle of seed, seedling, adult, flower, fruit stageOne step in the sequence of a life cycle compareTo describe how different organisms' life cycles are similar and different illustrateTo draw the stages of a life cycle exploreTo investigate and observe life cycle stages in living organisms

💡 Key Concepts

▸Complete metamorphosis (beetles, butterflies, flies) has four stages: egg → larva (feeding stage) → pupa (transformation stage) → adult (reproductive stage) — each stage looks dramatically different.
▸Incomplete metamorphosis (crickets, grasshoppers, dragonflies) has three stages: egg → nymph (looks like a small adult) → adult — the nymph and adult share similar body forms.
▸Plant life cycles follow the pattern: seed → seedling → adult plant → flower → fruit/seed — the entire cycle can take days (radish), months (most vegetables), or years (oak tree).

🍎 Teacher Guide

📌Use actual specimens or videos of each life stage, not just drawings — seeing a real larva, pupa, and adult of the same species makes the transformation concrete in a way that diagrams cannot achieve.
📌Compare a complete and incomplete metamorphosis side by side (mealworm and cricket work well in the classroom) — the contrast between a larva that looks nothing like the adult vs. a nymph that looks like a small adult is the key conceptual distinction.
📌Connect life cycles to conservation: many species are endangered because human activity disrupts critical life cycle stages (sea turtles cannot lay eggs on developed beaches; monarch butterflies need milkweed for their larva stage) — this application makes life cycle knowledge consequential.

Grade 4 · §112.6

Students investigate mixtures, energy transfer, seasons, Moon phases, the water cycle, weathering and erosion, renewable vs. nonrenewable resources, food webs, metamorphosis, and adaptations. Grade 4 TEKS contribute 8 Supporting Standards to the Grade 5 STAAR.

● 8 Supporting Standards on STAAR

📚

10 Key Vocabulary Words — Grade 4

Essential science words students encounter and use across all Grade 4 TEKS strands — includes STAAR-assessed vocabulary

water cycle

The continuous movement of water through evaporation, condensation, and precipitation, driven by the Sun

Earth ★ STAAR

weathering

The breaking down of rocks and soil into smaller pieces by water, wind, ice, or living things

Earth ★ STAAR

food web

A system of connected food chains showing how energy flows through multiple organisms in an ecosystem

Organisms ★ STAAR

renewable resource

A natural resource that can be replaced in a reasonable time, such as wind, sunlight, and water

Earth ★ STAAR

Moon phase

The changing appearance of the Moon as seen from Earth during its monthly orbit; follows a predictable pattern

Earth ★ STAAR

energy transfer

The movement of energy from one object or place to another — as in moving objects, waves, or sound

Force ★ STAAR

climate

The average weather conditions of a region measured over a long period of time (30+ years)

Earth ★ STAAR

decomposer

An organism such as bacteria or fungi that breaks down dead organisms and returns nutrients to the soil

Organisms ★ STAAR

deposition

The dropping of sediment in a new location when water, wind, or ice loses the energy to carry it

Earth ★ STAAR

mixture

A combination of two or more substances that each keep their own physical properties and can be separated

Matter

Grade 4 adds laser pointers, mirrors, and circuit-building materials.

All other expectations (A–G) match Grade 3 in structure, with increasing complexity in data analysis and engineering design.

4.1

Investigations. (A)–(G) as in Grade 3. Expanded tool list adds: laser pointers, mirrors, circuit-building materials, and calculators. Students plan and conduct descriptive, comparative, and experimental investigations.

📘 Key Vocabulary

investigationA planned, systematic study to answer a scientific question laser pointerA tool that emits a focused beam of light used in optics investigations mirrorA reflective surface used to study the behavior of light circuit-building materialsComponents used to construct electrical circuits calculatorA tool used to perform mathematical operations on scientific data balanceA tool used to compare the masses of two objects graduated cylinderA cylindrical tool used to measure liquid volume descriptive investigationAn investigation that observes and records without testing a variable experimental investigationAn investigation that tests the effect of one variable while controlling others prototypeA test model of a solution that can be improved based on results

💡 Key Concepts

▸Grade 4 adds circuit-building materials and laser pointers to the science toolkit — these tools allow students to investigate electrical circuits and the behavior of light, reflecting the new content in the curriculum.
▸Experimental investigations at Grade 4 test a specific hypothesis by changing one variable (independent variable) and measuring its effect (dependent variable) while controlling everything else.
▸The engineering design process is a formal cycle: identify a problem → define criteria and constraints → brainstorm → design → build prototype → test → evaluate → improve — this cycle repeats until the solution is satisfactory.

4.2

Data Analysis. (A) Identify model limitations; (B) Analyze data for patterns, features, or sources of error; (C) Use mathematical calculations to compare patterns; (D) Evaluate experimental and engineering designs.

📘 Key Vocabulary

dataMeasurements and observations used to identify patterns and relationships patternA repeated or predictable arrangement in data analyzeTo carefully examine data to identify features and relationships source of errorSomething that could cause inaccurate data in an investigation modelA representation of an object, process, or system limitationA flaw in a model that reduces its accuracy scaleThe proportion of a model compared to the real object mathematical calculationUsing numbers and operations to find patterns in data criteriaStandards used to determine whether a design works as intended evaluateTo judge the quality of an investigation or design using evidence

💡 Key Concepts

▸Sources of error can affect data quality — a bent measuring tool, inconsistent procedures, or misreading a scale are all sources of error that must be identified and corrected.
▸Using mathematical calculations in science — averaging multiple measurements, calculating the difference between values, or finding a ratio — transforms raw data into meaningful results.
▸A strong experimental design controls all variables except the one being tested — if two variables change at the same time, you cannot determine which one caused the observed effect.

4.3

Explanations & Communication. Develop evidence-based explanations; communicate individually and collaboratively; engage respectfully in scientific argumentation.

📘 Key Vocabulary

explanationA statement using evidence to describe why or how something happens evidenceObservations and data used to support a scientific claim solutionA plan that solves a problem, supported by scientific evidence communicateTo share scientific findings clearly with an audience collaborateTo work together with others to solve a scientific problem scientific argumentationA respectful exchange of claims and evidence conclusionA judgment about data and evidence reached after analysis formatThe method used to present scientific findings proposeTo offer a possible solution or explanation relevant evidenceInformation that directly supports the claim being made

💡 Key Concepts

▸A scientific explanation must be internally consistent — it cannot contradict observed data or established scientific principles — and must be the simplest explanation that fits all the evidence.
▸Communicating science to different audiences requires different formats — a detailed report for scientists; a graph for a data presentation; a poster or video for the general public.
▸Scientific argumentation means evaluating others' evidence and reasoning, not just their conclusions — 'Your evidence only shows correlation, not causation' is a scientific argumentation skill.

4.4

Scientists & Society. (A) Explain how scientific discoveries and innovative solutions impact science and society; (B) Research and explore STEM careers.

📘 Key Vocabulary

STEM careerA job in science, technology, engineering, or mathematics discoveryA new scientific finding that adds to our knowledge innovationA new method or product that improves something impactThe effect a discovery or technology has on society and the environment societyThe community of people that benefits from scientific and engineering work mentorA professional in a STEM field who guides students or newcomers resourceA tool or person used to explore science careers museumA resource for learning about scientific discoveries and careers professional organizationA group of people working in the same STEM field researchA careful investigation to discover new knowledge

💡 Key Concepts

▸Scientific discoveries build on each other — every major discovery opens new questions; Marie Curie's discovery of radioactivity led to nuclear medicine, X-ray technology, and nuclear energy.
▸STEM professionals work in industries including healthcare, aerospace, environmental science, computer science, agriculture, and manufacturing — there is a STEM career connected to almost every aspect of daily life.
▸Research skills — using libraries, evaluating online sources, interviewing experts, visiting museums — are essential tools for learning about STEM careers and the science they involve.

4.5A

Patterns: Identify and use patterns to explain scientific phenomena or to design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable way seasonA repeating time period with predictable temperature and daylight patterns Moon phaseOne of the predictable appearances of the Moon as it orbits Earth water cycleA continuously repeating pattern of evaporation, condensation, and precipitation food webA system showing the pattern of energy flow between organisms orbitThe predictable repeated path of a planet or moon cycleA pattern that keeps repeating, such as the water cycle predictTo say what will happen next by recognizing a pattern sequenceThe order of stages in a repeating cycle dataMeasurements used to identify patterns over time

💡 Key Concepts

▸The water cycle is a pattern — evaporation, condensation, and precipitation repeat continuously, driven by solar energy, with no beginning or end.
▸Moon phases form a predictable monthly pattern — new moon → waxing crescent → first quarter → waxing gibbous → full moon → waning gibbous → last quarter → waning crescent → new moon — this cycle repeats every 29.5 days.
▸Seasonal patterns in temperature and daylight repeat every year — collecting data over multiple years confirms that these patterns are consistent and predictable, making them reliable for forecasting.

4.5B

Cause & Effect: Identify and investigate cause-and-effect relationships to explain scientific phenomena or analyze problems.

📘 Key Vocabulary

causeThe reason something happens effectThe result of a cause weatheringErosion is an effect caused by the action of water, wind, or ice erosionMovement of sediment; caused by flowing water, wind, or ice seasonA change caused by Earth's axial tilt and orbit around the Sun energy transferWhat happens when moving objects, waves, or sound affect another object frictionA force that causes moving objects to slow down or stop renewableDescribing resources that can be replenished naturally investigateTo explore carefully to find the cause of a phenomenon relationshipThe connection between a cause and the effect it produces

💡 Key Concepts

▸Weathering is caused by water, wind, ice, temperature changes, and biological activity — each agent has a specific mechanism for breaking rock into smaller particles.
▸Energy transfer is a cause-and-effect process — a moving object (cause) transfers kinetic energy during a collision (effect), causing the struck object to start moving.
▸Climate change is a cause-and-effect issue — increased greenhouse gas emissions (cause) trap more heat in the atmosphere (effect), which causes ice to melt, sea levels to rise, and weather patterns to shift.

4.5C

Scale: Use scale, proportion, and quantity to describe, compare, or model different systems.

📘 Key Vocabulary

scaleThe proportion of a model compared to the real thing proportionThe relationship between the sizes of different parts modelA scaled representation used to study a system or process quantityThe amount of something in a system compareTo describe similarities and differences in scale seasonA change in temperature and daylight that varies in magnitude water cycleA system that can be modeled at different scales measureTo find the actual size of something using a measuring tool relative sizeThe size of something compared to another object describeTo explain scale relationships in a scientific model

💡 Key Concepts

▸Scale is essential for comparing objects in space — Jupiter's diameter is 11 times Earth's; the Sun's diameter is 109 times Earth's — these proportions help us understand the true enormity of the solar system.
▸Quantity matters in chemical reactions — doubling the amount of a solute in a solution doubles its concentration; this proportional relationship is a fundamental principle of chemistry.
▸Scale models of Earth's layers use proportional thickness — Earth's crust is thin relative to the whole (like the skin of an apple), while the mantle is the thickest layer — scale representations make this clear.

4.5D

Systems: Examine and model the parts of a system and their interdependence in the function of the system.

📘 Key Vocabulary

systemA group of parts that work together as a whole water cycleA system in which water moves between the atmosphere and Earth's surface food webA system showing how energy flows through many interconnected food chains electrical circuitA system of components that allows electrical energy to flow ecosystemA system of living and nonliving things interacting interdependenceWhen parts of a system depend on each other to function modelA representation of a system showing how its parts are connected functionThe job each part performs within the system interactWhen parts of a system affect each other examineTo look carefully at how system parts work together

💡 Key Concepts

▸The water cycle is a system with interconnected parts — the ocean is the main water reservoir; the Sun provides energy for evaporation; the atmosphere holds water vapor; precipitation returns water to Earth.
▸A food web is a complex system — each organism plays a role (producer, consumer, decomposer) and the web functions because all roles are filled; removing any role disrupts the entire system.
▸Earth's layers form a system — the inner core generates heat; the outer core generates the magnetic field; the mantle drives plate tectonics; the crust supports life — each layer's function affects the others.

4.5E

Energy & Matter: Investigate how energy flows and matter cycles through systems and how matter is conserved.

📘 Key Vocabulary

energyThe ability to do work or cause change matterAnything that has mass and takes up space flowThe directional movement of energy through a system cycleThe repeated pathway of matter through a system conservationThe principle that energy and matter are not created or destroyed water cycleA system in which water cycles between liquid, gas, and solid states food webA system showing how energy flows between producers and consumers electrical circuitA system in which electrical energy flows and transforms transferTo move energy from one object or place to another transformTo change from one form of energy to another

💡 Key Concepts

▸In the water cycle, matter (water) cycles continuously — the same water molecules that were in the ocean become rain, then river water, then evaporate again — water is conserved throughout the cycle.
▸In food webs, energy flows in one direction (from producers to consumers), but matter cycles — carbon in a plant becomes carbon in a caterpillar, then in a bird, then back to the soil through decomposition.
▸Conservation of matter means nothing is lost in a system — the mass of reactants equals the mass of products; the total matter in an ecosystem stays the same even as it cycles between organisms and the environment.

4.5F

Structure & Function: Explain the relationship between the structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA physical feature of an organism or object with a specific form functionThe purpose or job of a structure adaptationA structure or behavior that helps an organism survive metamorphosisA process in which an organism's body structure completely changes root systemThe network of roots whose structure allows absorption of water and nutrients finA fish structure shaped for steering and balance in water decomposerAn organism whose structure allows it to break down dead matter predatorAn organism with structures adapted to catch and consume prey relationshipThe connection between how a structure is shaped and what it does analyzeTo study the relationship between structure and function

💡 Key Concepts

▸In the water cycle, structure and function are connected — clouds (structure) form when water vapor condenses around dust particles (function: condensation nuclei) and produce precipitation.
▸Food web structure determines function — producers must be present at the base for consumers to exist; decomposers must be present to recycle nutrients; the web's structure determines its stability.
▸An electrical circuit's function depends on its structure — all components must be connected in a complete (closed) loop; a gap in the circuit (open circuit) prevents current from flowing.

4.5G

Stability & Change: Explain how factors or conditions impact stability and change in objects, organisms, and systems.

📘 Key Vocabulary

stableRemaining the same under normal conditions changeBecoming different; ecosystems change when conditions shift weatheringA slow, gradual change to Earth's surface caused by water, wind, or ice erosionMovement of weathered particles; a slow change to Earth's surface climateThe long-term average weather pattern; changes slowly over decades ecosystemA system that is stable or changes based on environmental conditions factorA condition such as temperature or precipitation that affects stability nonrenewable resourceA resource that is depleted over time and cannot be replaced predictTo say how a change in conditions will affect a system stabilityThe state of remaining unchanged under normal conditions

💡 Key Concepts

▸Stable ecosystems can withstand small disturbances — a healthy forest ecosystem with diverse species can recover from a single drought year; a less diverse ecosystem may not recover.
▸Nonrenewable resource depletion causes permanent change — once fossil fuels are burned and oil wells run dry, those resources are gone; this is an irreversible change to Earth's systems.
▸Climate stability depends on a balance of greenhouse gases — human activities increasing CO₂ levels are disrupting this balance, causing global temperatures to rise and weather patterns to shift.

4.6A

Investigate and compare mixtures by identifying and measuring the physical properties of the substances that are combined.

📘 Key Vocabulary

mixtureA combination of two or more substances that each keep their own properties physical propertyA characteristic of matter that can be observed or measured substanceA particular kind of matter with uniform properties combineTo join two or more substances together to form a mixture separateTo take apart a mixture using physical methods solubilityThe ability of a substance to dissolve in a liquid magnetismA property used to separate iron from non-magnetic substances densityA property that determines whether a substance sinks or floats investigateTo observe and measure the properties of substances in a mixture identifyTo name the substances present in a mixture by their properties

💡 Key Concepts

▸A mixture is two or more substances combined that each keep their own properties — sand and water mixed together: sand remains gritty and insoluble; water remains clear and liquid.
▸Substances in a mixture can be separated by using their different physical properties — iron filings and sand can be separated with a magnet because iron is magnetic and sand is not.
▸Investigating mixtures involves measuring the physical properties of each substance before and after mixing — comparing before and after shows that properties are retained in a mixture.

🍎 Teacher Guide

📌Design a mixture investigation with at least four substances with distinctly different properties — use iron filings, sand, salt, and gravel — and challenge students to predict and then confirm which property (magnetism, particle size, solubility) allows each substance to be separated.
📌Emphasize that mixtures are different from compounds: in a mixture, substances keep their properties and can be separated; in a compound (like water), the components cannot be separated by physical means — this distinction previews Grade 5 content.
📌Connect to real-world separation: mining operations, water treatment plants, and recycling facilities all use physical properties to separate mixtures — showing these industrial applications makes the science consequential.

4.6B

Demonstrate that matter can be changed from one state to another by heating or cooling.

📘 Key Vocabulary

state of matterThe form matter takes — solid, liquid, or gas heatingAdding thermal energy to change matter to a higher-energy state coolingRemoving thermal energy to change matter to a lower-energy state meltingChanging from solid to liquid by adding heat freezingChanging from liquid to solid by removing heat evaporationChanging from liquid to gas by adding heat condensationChanging from gas to liquid by removing heat reversibleA change that can be undone by adding or removing thermal energy demonstrateTo show that matter changes state when heated or cooled temperatureThe amount of thermal energy in a substance; determines its state

💡 Key Concepts

▸Matter changes state when thermal energy is added or removed — adding heat changes solid to liquid (melting) or liquid to gas (evaporation); removing heat changes gas to liquid (condensation) or liquid to solid (freezing).
▸State changes are physical changes — the chemical identity of the substance does not change; water is still H₂O whether it is ice, liquid water, or steam.
▸State changes are generally reversible — ice melts to water when heated and refreezes when cooled; the same substance cycles through states as energy is added and removed.

🍎 Teacher Guide

📌Use the same substance (water) to demonstrate all four state change directions — melt ice, boil water, freeze water, and condense steam on a cold mirror — establishing that the same substance can undergo multiple reversible state changes with the same material.
📌Build a state change diagram together as a class: a circle with solid, liquid, and gas at the vertices, with labeled arrows showing melting, freezing, evaporation, and condensation — students copy and use this reference throughout the unit.
📌Connect to the water cycle: evaporation, condensation, and precipitation are state changes occurring at a planetary scale, driven by solar energy — this connection bridges the chemistry and Earth science standards meaningfully.

4.6C

Investigate and identify that the total mass of a mixture or solution does not change when substances are combined.

📘 Key Vocabulary

mixtureA combination of two or more substances solutionA mixture in which one substance dissolves completely in another massThe amount of matter in a substance, measured before and after combining conservation of massThe principle that the total mass of a mixture equals the sum of its parts soluteThe substance that dissolves in a solution solventThe substance in which a solute dissolves total massThe combined mass of all substances in a mixture measureTo find the mass of substances before and after combining them investigateTo test and confirm that mass is conserved when substances are combined identifyTo confirm that total mass does not change when a mixture is formed

💡 Key Concepts

▸The Law of Conservation of Mass states that the total mass of materials does not change when substances are mixed — mixing 5 g of salt with 100 g of water gives 105 g of salt water.
▸Conservation of mass applies to all mixtures and solutions — even when a substance dissolves and seems to disappear, its mass is still present in the solution.
▸Verifying conservation of mass requires measuring the total mass before AND after mixing — if masses are equal, mass was conserved; any apparent difference is due to measurement error.

🍎 Teacher Guide

📌Use a simple balance to prove conservation of mass before and after mixing: measure 50g salt + 100g water, mix, and then measure the solution — confirming 150g builds trust in the law of conservation and introduces quantitative verification.
📌Challenge students with a cognitive conflict: "Where did the salt go? It disappeared — so the mass should decrease, right?" — resolving this conflict through measurement builds deeper understanding than simply telling students the law.
📌Connect to Grade 5 content: in Grade 5, students will study conservation of mass in solutions with more precision — framing Grade 4 as "discovering" the law plants conceptual foundation for the more rigorous treatment ahead.

4.7A

Investigate and describe the effects of friction on moving objects, including objects that are stationary.

📘 Key Vocabulary

frictionA contact force that opposes the motion of a moving object surfaceThe outer layer of an object; surface type affects friction motionThe movement of an object; friction slows or stops motion stationaryNot moving; friction also acts on objects trying to start moving investigateTo test how different surfaces affect the friction on an object describeTo explain how friction affects the speed and direction of moving objects roughA surface texture that increases friction smoothA surface texture that decreases friction forceA push or pull; friction is a type of contact force resistanceThe opposition to motion created by friction

💡 Key Concepts

▸Friction is a contact force that always opposes motion — when an object slides across a surface, friction acts in the opposite direction of movement, slowing the object down.
▸Friction depends on two factors: the roughness of the surfaces in contact and the force pressing them together — rough surfaces create more friction; heavier objects create more friction.
▸Friction is useful in many applications — it allows cars to brake, shoes to grip the floor, and gears to transfer force in engines — without friction, these functions would be impossible.

🍎 Teacher Guide

📌Create a friction investigation comparing three surface types (smooth tile, carpet, sandpaper) using the same object (a toy car) and measuring stopping distance — the data directly shows how friction strength depends on surface texture.
📌Address the misconception that friction is always "bad" — design two tasks: one where friction is useful (stopping the car, gripping a jar lid) and one where it is unwanted (slowing a machine, wearing down a shoe) — balance is the key insight.
📌Connect to engineering: ball bearings, lubricants, and smooth surfaces are all engineering solutions to reduce friction — while rubber soles, anti-lock brakes, and rough handles are solutions to increase it — students design their own friction-modifying solution.

4.7B

Design a solution that uses force to solve a problem by completing the engineering design process.

📘 Key Vocabulary

forceA push or pull used to solve a problem engineering designThe process of identifying a problem and creating, testing, and improving a solution designA plan for solving a problem using force criteriaThe standards a solution must meet to be considered successful constraintsThe limitations placed on a design such as materials and cost prototypeAn early model of a solution that is tested and improved testTo try a solution to see if it meets the criteria improveTo make a design better based on test results solutionA plan that uses force to solve a problem evaluateTo judge how well a solution meets the design criteria

💡 Key Concepts

▸The engineering design process applied to force problems: define the problem (a door that slams), brainstorm solutions (door stop, spring hinge, pneumatic closer), build prototypes, test, and improve.
▸Criteria are what the solution must achieve — 'The door must close slowly and quietly'; constraints are the limits — 'The solution must cost less than $20 and require no permanent modifications.'
▸Testing and improving a design are critical steps — rarely does a first prototype meet all criteria; engineers iterate, making small improvements based on test data until the design is satisfactory.

🍎 Teacher Guide

📌Walk students through the full engineering design process explicitly: (1) Define problem, (2) Brainstorm solutions, (3) Select best solution, (4) Build prototype, (5) Test against criteria, (6) Evaluate and improve — post these steps and refer to them throughout the project.
📌Choose a design challenge that connects to force content: a ramp to get a ball into a cup, a sail-powered boat, or a catapult — the challenge should require students to apply their knowledge of pushes, pulls, and friction to the design.
📌Require a written engineering design journal: students document each decision and its justification, which builds metacognitive awareness of their design process and provides assessment evidence.

4.8A

Investigate and identify the transfer of energy by objects in motion, waves in water, and sound.

● Supporting

📘 Key Vocabulary

energy transferThe movement of energy from one object or place to another waveA pattern of disturbance that carries energy through matter soundEnergy transferred through matter as vibrations motionThe movement of an object; kinetic energy is transferred through collisions vibrationThe rapid back-and-forth movement that transfers sound energy collisionWhen a moving object strikes another, transferring kinetic energy investigateTo test how energy is transferred by different phenomena identifyTo recognize when energy is being transferred in a system mediumThe material through which energy waves travel kinetic energyThe energy of a moving object that is transferred during collisions

💡 Key Concepts

▸Energy transfer occurs when energy moves from one object or system to another — a moving ball (kinetic energy) hits a stationary ball and transfers energy, causing the stationary ball to move.
▸Sound transfers energy through a medium — vibrating matter creates pressure waves that travel through air (or other media), transferring energy from the source to the listener's ears.
▸Water waves transfer energy across the surface of water — the water molecules move up and down but do not travel forward; only the energy moves, not the water itself.

🍎 Teacher Guide

📌Use the three types of energy transfer as three separate mini-investigations on the same day: collision between balls (objects in motion), wave in a rope (waves), and vibrating tuning fork near water (sound) — observing all three on the same day builds the pattern that energy transfer is a unifying concept.
📌Ask students to identify what is NOT moving from one place to another — in wave transfer, the water is not moving across the pond; in sound, the air is not blowing toward you — this counterintuitive insight is the core of wave energy transfer.
📌Connect to STAAR: STAAR often presents a scenario and asks students to identify the type of energy transfer — give students practice with written scenarios in addition to hands-on investigation.

⭐ STAAR Practice — 4.8A — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.8A

A student drops a rock into a still pond. Ripples spread outward from where the rock landed. What does this demonstrate about energy?

AEnergy was transferred from the moving rock to the water, creating waves that carry energy outward across the surface.
BThe water moved outward, carrying the energy and all the water molecules with it.
CEnergy was created when the rock hit the water and caused the ripples.
DThe rock's energy disappeared when it entered the water and new energy was made by the ripples.

Meets Grade Level TEKS 4.8A

A student plucks a guitar string. The string vibrates, the air vibrates, and a listener across the room hears the sound. Which correctly describes the energy transfer in this sequence?

AMechanical energy (the pluck) transfers to the string (vibration), which transfers to the air (sound waves), which transfers to the listener's ears as sound energy.
BThe sound energy is created at the listener's ear when it detects the vibration.
CEnergy travels from the listener's ear back to the guitar string, causing it to vibrate.
DThe guitar creates new energy with each pluck that disappears after the sound fades.

Masters Grade Level TEKS 4.8A

A student sets up three demonstrations: (1) A billiard ball hits a stationary ball — the stationary ball rolls away. (2) A vibrating tuning fork is held near water — the water surface ripples. (3) A speaker plays music — a person across the room hears it. What single concept connects all three demonstrations?

AEnergy transfer — in each case, energy moves from one object or location to another through different mechanisms: collision, vibrations in water, and sound waves in air.
BEnergy creation — each demonstration creates new energy from materials that had none before.
CEnergy absorption — objects absorb energy from their surroundings in each demonstration.
DEnergy destruction — energy is used up and disappears after each demonstration is complete.

4.8B

Observe and describe that electrical energy can be transformed into light, sound, or thermal energy using circuits.

📘 Key Vocabulary

electrical energyA form of energy carried by moving electrons through a circuit circuitA complete, closed path through which electrical energy flows transformTo change from one form of energy to another light energyA form of energy produced when electrical energy flows through a bulb sound energyA form of energy produced when electrical energy powers a speaker thermal energyA form of energy released as heat when electrical energy flows motionMovement produced when electrical energy powers a motor conductorA material that allows electrical energy to flow through it observeTo watch and record how electrical energy is transformed in a circuit describeTo explain what form of energy electrical energy becomes in a circuit

💡 Key Concepts

▸Electrical energy in a circuit can be transformed into light (light bulb), sound (buzzer or speaker), thermal energy (resistive heating elements), or motion (electric motor).
▸The transformation of electrical energy is useful — toasters transform electrical to thermal energy to toast bread; speakers transform electrical to sound energy; motors transform electrical to mechanical energy.
▸Energy transformation is never 100% efficient — a light bulb transforms electrical energy to light AND heat; the heat is wasted energy that cannot be recovered for useful work.

🍎 Teacher Guide

📌Build simple circuits in sequence: first a complete circuit with a battery and bulb; then add a switch; then replace the bulb with a motor; then with a buzzer — each substitution demonstrates a different energy transformation using the same electrical energy source.
📌Use the language of transformation deliberately: "The battery is a source of electrical energy. The motor is a device that transforms electrical energy into mechanical energy" — explicit use of transformation language builds precise scientific communication.
📌Connect to household devices: every electrical device in students' homes transforms electrical energy into something useful — making a list and identifying the transformation for each (phone → light + sound + heat, refrigerator → thermal energy removed from food) extends learning.

4.9A

Collect and analyze data to identify sequences and predict patterns of change in seasons such as changes in temperature and length of daylight.

● Supporting

📘 Key Vocabulary

seasonOne of four repeating time periods with distinct temperature and daylight patterns temperatureA measurable property that changes predictably with each season daylightThe number of hours of sunlight; increases in summer and decreases in winter dataMeasurements of temperature and daylight collected over time patternThe predictable change in temperature and daylight throughout the year predictTo say what temperature or daylight will be in an upcoming season sequenceThe order of seasons: winter, spring, summer, fall analyzeTo examine data to find patterns in seasonal change collectTo gather data about temperature and daylight over time cycleThe year-long repeating pattern of seasonal changes

💡 Key Concepts

▸Earth's tilt causes seasons — when the Northern Hemisphere is tilted toward the Sun, it receives more direct sunlight for more hours per day, creating summer; when tilted away, winter occurs.
▸Day length (number of daylight hours) changes throughout the year — summer has the most daylight hours (up to 15+ hours near the summer solstice); winter has the fewest (as few as 9 hours near the winter solstice).
▸Collecting and analyzing seasonal data confirms predictable patterns — temperature and daylight data from one year predicts the next year's pattern, because Earth's orbit and tilt are consistent.

🍎 Teacher Guide

📌Build a year-long temperature and daylight data collection practice — even 5 minutes per week recording temperature and sunrise/sunset times from a weather app — so students have personal data to analyze when the pattern investigation occurs.
📌Use a daylight hours graph for your city across the entire year — analyzing the sine curve shape leads students to discover that the change is gradual and continuous, not a sudden shift between seasons.
📌Connect to Earth's tilt: the reason daylight increases in summer and temperature follows is because the hemisphere is tilted toward the Sun, receiving more direct solar energy per unit area for longer each day — this causal explanation prevents "Earth is closer to the Sun in summer" misconceptions.

⭐ STAAR Practice — 4.9A — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.9A

A student records temperature data for one year in Texas. Which month would MOST LIKELY have the highest average temperature?

AJuly — summer months have the highest temperatures because Earth's Northern Hemisphere receives more direct sunlight for longer periods each day.
BDecember — the Sun is directly overhead in winter, causing the most heating.
CMarch — spring immediately brings the hottest temperatures of the year.
DOctober — fall is the warmest season because it comes right after summer.

Meets Grade Level TEKS 4.9A

A student collects data on daylight hours in Texas each month for one year. She finds that daylight hours increase from January through June, then decrease from June through December. Which conclusion is BEST supported by this pattern?

AThe length of daylight changes in a predictable cycle each year, with the most daylight in summer and least in winter, caused by Earth's tilted axis as it orbits the Sun.
BDaylight hours are random and the pattern the student observed was a coincidence.
CThe Sun produces more light energy in June and less in December.
DDaylight hours only change in Texas; other locations have the same amount of daylight all year.

Masters Grade Level TEKS 4.9A

A student in Houston collects temperature and daylight data for a full year: summer has the most daylight hours AND highest temperatures; winter has the fewest daylight hours AND lowest temperatures; spring and fall have intermediate values. She wants to predict next year's pattern. Which prediction is BEST supported?

ANext year's seasonal pattern will be nearly identical because Earth's consistent orbit and tilt create a reliable, predictable annual cycle of temperature and daylight changes.
BNext year's pattern will be completely different because weather is random and unpredictable.
CNext year will have the opposite pattern because seasons reverse every other year.
DShe cannot predict next year because one year of data is insufficient to identify a valid scientific pattern.

4.9B

Collect and analyze data to identify sequences and predict patterns of change in the observable appearance of the Moon from Earth.

● Supporting

📘 Key Vocabulary

Moon phaseOne of the predictable appearances of the Moon as seen from Earth new moonThe phase when the Moon is between Earth and the Sun; appears dark full moonThe phase when Earth is between the Moon and Sun; appears fully lit waxingDescribing Moon phases that appear to grow larger each night waningDescribing Moon phases that appear to shrink each night crescentA thin curved phase of the Moon visible just after new or before new moon quarter moonThe phase when half of the Moon's lit side is visible from Earth lunar cycleThe predictable repeating cycle of Moon phases, lasting about 29.5 days patternThe predictable sequence in which Moon phases repeat each month predictTo say what Moon phase will appear on a specific date

💡 Key Concepts

▸Moon phases result from the Moon's orbit around Earth — as the Moon moves, we see different portions of its sunlit side, creating a predictable monthly cycle of phases.
▸The Moon does not produce its own light — it reflects sunlight; phases occur because the Moon orbits Earth and we see different amounts of the illuminated side depending on the Moon's position.
▸Collecting Moon phase data over 30 days reveals the pattern — phases change predictably from new moon through full moon and back, repeating every 29.5 days.

🍎 Teacher Guide

📌Use a Moon journal for 30 days — students draw the Moon's shape each night (or look it up if cloudy) — so the pattern of phases emerges from student-collected data rather than being given as information.
📌Build a physical model: a flashlight represents the Sun, the student's head represents Earth, and they hold a ball (the Moon) and rotate it around their head — the same half is always lit, but they see different portions of the lit half at different positions.
📌Connect to tides and STAAR connections: Moon phases affect tides; the full and new moon produce spring tides — this cross-standard connection shows that the Moon's orbit has multiple effects on Earth's systems.

⭐ STAAR Practice — 4.9B — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.9B

A student observes that the Moon looks like a fully lit circle one night. What phase is the Moon in?

AFull moon — Earth is between the Sun and Moon, so the entire sunlit side of the Moon faces Earth.
BNew moon — the Moon is between Earth and the Sun, making it appear fully lit.
CFirst quarter — only half of the Moon's sunlit side is visible from Earth.
DWaxing crescent — only a small sliver of the Moon is lit and visible.

Meets Grade Level TEKS 4.9B

A student records Moon observations for 30 days. On Day 1: new moon (not visible). Day 8: first quarter (half lit). Day 15: full moon. Day 22: last quarter (half lit again). What phase will MOST LIKELY appear on approximately Day 29–30?

ANew moon — the lunar cycle is approximately 29.5 days, so the Moon returns to the new moon phase, completing the cycle.
BFull moon — the cycle repeats the full moon phase after the last quarter.
CFirst quarter — the Moon reaches first quarter again immediately after the last quarter.
DWaxing gibbous — the cycle always ends in a gibbous phase.

Masters Grade Level TEKS 4.9B

A student claims the Moon changes shape throughout the month. A scientist says the Moon's shape never changes — only how much of its lit side is visible from Earth changes. Which explanation BEST supports the scientist's claim?

AThe Moon is always a sphere; as it orbits Earth, the angle between Sun, Moon, and Earth changes, revealing different portions of the Moon's sunlit half to observers on Earth — creating the appearance of changing shape.
BEarth's shadow falls on different parts of the Moon each night, blocking its light and making it appear to change shape.
CThe Moon actually shrinks and grows — it is smallest during a new moon and largest during a full moon.
DClouds in Earth's atmosphere cover parts of the Moon, creating the appearance of different shapes each night.

4.10A

Describe and illustrate the continuous movement of water through the water cycle and explain the role of the Sun as a major source of energy in this process.

● Supporting

📘 Key Vocabulary

water cycleThe continuous movement of water between the atmosphere and Earth's surface evaporationThe process by which liquid water changes to water vapor using solar energy condensationThe process by which water vapor cools and changes to liquid water precipitationWater that falls from clouds as rain, snow, sleet, or hail runoffWater that flows across the land surface into rivers, lakes, and oceans water vaporWater in its gaseous state; rises into the atmosphere during evaporation SunThe primary source of energy that drives evaporation in the water cycle atmosphereThe layer of air around Earth where water vapor and clouds exist illustrateTo draw or diagram the steps of the water cycle continuousNever stopping; the water cycle is a continuous, repeating process

💡 Key Concepts

▸The Sun powers the water cycle — solar energy heats ocean and lake water, causing evaporation that puts water vapor into the atmosphere; without the Sun, the water cycle would stop.
▸The water cycle continuously recycles Earth's water — no water is created or destroyed; the same water molecules that were in an ancient ocean may now be in your drinking glass.
▸Clouds form when water vapor rises, cools, and condenses around tiny particles — the resulting water droplets combine to form clouds; when droplets become heavy enough, they fall as precipitation.

🍎 Teacher Guide

📌Use the closed plastic bag model as the entry phenomenon: tape a bag with a small amount of water to a sunny window and observe over several days — students see evaporation, condensation, and precipitation all occurring in a closed system, proving the cycle is continuous.
📌Map the water cycle explicitly to the solar energy source: the Sun heats the ocean (evaporation), energy carries water vapor aloft (condensation forms clouds), gravity returns it as precipitation — energy from the Sun drives every step.
📌Connect to local Texas geography: the Gulf of Mexico is a major moisture source for Texas weather — warm gulf water evaporates and moisture-laden air moves inland to produce rain — making the water cycle personal to students' home state.

⭐ STAAR Practice — 4.10A — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.10A

Water in the ocean is heated by the Sun and changes into water vapor that rises into the air. What process is being described?

AEvaporation — the Sun's energy converts liquid ocean water into water vapor that enters the atmosphere.
BCondensation — water vapor in the air turns into liquid water droplets.
CPrecipitation — water falls from clouds back to Earth's surface.
DRunoff — water flows across land back into rivers and oceans.

Meets Grade Level TEKS 4.10A

A student examines a diagram of the water cycle showing: ocean water evaporating → water vapor forming clouds → rain falling on land → water flowing into a river → back to the ocean. Which role does the Sun play in this cycle?

AThe Sun provides the thermal energy that drives evaporation — without solar heat, water cannot convert from liquid to vapor and the cycle cannot continue.
BThe Sun causes precipitation by pulling water vapor down from clouds.
CThe Sun creates new water from hydrogen and oxygen gases in the atmosphere.
DThe Sun's gravity pulls rivers back toward the ocean to complete the water cycle.

Masters Grade Level TEKS 4.10A

A student models the water cycle in a sealed clear plastic bag: she adds water and tapes the bag to a sunny window. After several hours, she sees water droplets on the upper, cooler part of the bag, then the droplets fall back to the water below. What processes is she observing and what drives them?

AThe Sun's energy evaporates the water (liquid → vapor), water vapor condenses on the cooler upper surface (vapor → liquid droplets), and droplets fall as precipitation — modeling the complete water cycle driven by solar energy.
BOnly condensation occurs — water only condenses in a closed system and never evaporates.
CThe bag creates new water from the air; this does not model the real water cycle.
DOnly evaporation occurs — the droplets on the upper bag represent a different process than precipitation.

4.10B

Model and describe slow changes to Earth's surface caused by weathering, erosion, and deposition from water, wind, and ice.

● Supporting

📘 Key Vocabulary

weatheringThe breaking down of rocks into smaller particles by water, wind, or ice erosionThe movement of weathered rock and soil particles from one place to another depositionThe dropping of transported sediment in a new location sedimentLoose particles of rock and soil carried by water, wind, or ice glacierA large mass of slow-moving ice that erodes and deposits rock deltaA landform created when a river deposits sediment at its mouth canyonA deep, narrow valley created by erosion from flowing water over time sand duneA mound of sand formed by wind erosion and deposition modelA physical or visual representation of weathering, erosion, and deposition slow changeA gradual change to Earth's surface that occurs over long periods of time

💡 Key Concepts

▸Weathering breaks rocks into sediment; erosion transports the sediment; deposition drops the sediment in a new location — all three processes work together to reshape Earth's surface.
▸These processes operate at different speeds depending on climate — in wet, humid regions, chemical weathering and erosion are rapid; in dry deserts, wind erosion dominates and mechanical weathering is slower.
▸Landforms created by erosion and deposition include: canyons (carved by flowing water), sand dunes (formed by wind deposition), deltas (formed by river deposition), and glacial valleys (carved by glaciers).

🍎 Teacher Guide

📌Use a stream table as the primary investigation tool: vary slope, water flow rate, and surface cover to observe how each factor affects erosion and deposition — students produce and record real data about the three processes.
📌Display a side-by-side comparison of fast erosion examples (flash floods, construction site runoff) and slow erosion examples (gradual canyon formation, beach erosion over decades) — establishing that the same three processes operate at vastly different time scales.
📌Connect to conservation: explain that poor land management accelerates erosion — deforestation, overgrazing, and paving increase runoff and erosion rate — and that conservation practices (terracing, replanting, buffer zones) reduce it.

⭐ STAAR Practice — 4.10B — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.10B

A river carries small rock particles downstream and drops them where the river slows at its mouth. What Earth process is occurring when the particles are dropped?

ADeposition — the river drops (deposits) sediment particles when it slows down and no longer has enough energy to carry them.
BErosion — the river is carrying particles away from their original location.
CWeathering — the water is breaking the particles into smaller pieces.
DEvaporation — the water turns to vapor and the particles sink to the bottom.

Meets Grade Level TEKS 4.10B

Over thousands of years, wind carries sand grains and grinds them against sandstone cliffs. The cliffs slowly become smoother and smaller. The sand collects at the base of the cliffs. Which sequence of Earth processes is occurring?

AWeathering (wind grinds and breaks rock) → Erosion (wind carries sand particles) → Deposition (sand collects at cliff base).
BErosion (wind breaks the rock) → Deposition (sand stays in place) → Weathering (sand erodes the pile).
CDeposition → Weathering → Erosion — these processes always happen in reverse order.
DOnly weathering is occurring — erosion and deposition require water, not wind.

Masters Grade Level TEKS 4.10B

Students model erosion using a stream table: they pour water down a slope of sand and observe where the sand moves. They test bare sand, sand covered with grass, and sand covered with pebbles. Bare sand loses the most material. Which conclusion is BEST supported, and how does it connect to real-world landform formation?

APlant cover and larger particles reduce erosion because they slow water and anchor particles — in real landscapes, vegetated areas erode less and maintain their shape, while bare areas erode quickly, eventually forming valleys, gullies, and canyons.
BWater always erodes equally regardless of surface type; the model results were caused by measurement error.
CPebbles erode fastest because they are heavier and easier for water to carry; grass has no effect on erosion.
DErosion only occurs in models; real Earth surfaces are too hard for water to cause significant erosion.

4.10C

Differentiate between weather and climate.

● Supporting

📘 Key Vocabulary

weatherThe current atmospheric conditions at a specific time and place climateThe average weather conditions of a region measured over 30 or more years temperatureA measurable property of weather and climate precipitationThe amount of rainfall or snowfall; part of both weather and climate averageA mathematical value representing typical conditions over a long period short-termDescribing conditions that change from day to day, like weather long-termDescribing conditions measured over decades, like climate differentiateTo explain the key differences between two similar concepts regionA geographic area with specific climate characteristics dataMeasurements used to describe both weather and climate

💡 Key Concepts

▸Weather describes what is happening in the atmosphere right now — today is rainy and 65°F. Climate describes the long-term (30+ year) average conditions for a region — Houston's climate is humid subtropical with hot summers.
▸The key distinction is time scale — weather changes from day to day; climate is the average over decades. A single hot day is weather; consistently hot summers year after year are part of the climate.
▸Climate determines what clothes you keep in your closet (heavy coats for cold climates); weather determines what you wear each day — both concepts are important for daily decision-making.

🍎 Teacher Guide

📌Use a T-chart comparison approach: collect examples of weather statements and climate statements from newspaper weather reports and climate descriptions, then have students classify each — repeated classification builds the distinction through practice.
📌Address the common conversational conflation: "The weather here is always hot" actually describes climate, not weather — teaching students to listen for language clues ("always," "usually," "on average" = climate; "today," "this week," "right now" = weather) builds real-world literacy.
📌Connect to climate change: climate change describes a shift in long-term climate patterns, not just unusual weather on any given day — this distinction is important for scientific literacy and becomes increasingly relevant as students advance.

⭐ STAAR Practice — 4.10C — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.10C

A student says: 'It is raining today in Houston.' Is the student describing weather or climate?

AWeather — it describes the current atmospheric conditions at a specific time and place.
BClimate — it describes Houston's typical rainfall pattern over many years.
CBoth weather and climate — rain is part of both concepts.
DNeither — weather and climate only describe temperature, not precipitation.

Meets Grade Level TEKS 4.10C

A student reads two statements: (1) 'San Antonio averages 32 inches of rain per year and has hot summers and mild winters.' (2) 'Tomorrow, San Antonio will have thunderstorms with temperatures near 90°F.' Which statement describes CLIMATE and which describes WEATHER?

AStatement 1 is climate (long-term average patterns for a region); Statement 2 is weather (specific short-term forecast for tomorrow).
BStatement 1 is weather (it mentions rain); Statement 2 is climate (it mentions temperatures).
CBoth statements describe weather because they both mention rain and temperature.
DBoth statements describe climate because they are both about San Antonio.

Masters Grade Level TEKS 4.10C

A student visits El Paso in July (95°F, very dry) and her friend visits Houston in July (95°F, humid, with afternoon storms). Both cities had similar temperatures that day, but a scientist explains their climates are very different. What BEST explains why two cities can have similar weather but different climates?

AWeather describes what happened on one day (both cities were hot); climate describes long-term patterns — El Paso has an arid desert climate with very little yearly rainfall, while Houston has a humid subtropical climate with high annual rainfall. Similar weather on one day does not mean similar climates.
BBoth cities have the same climate because they had similar temperatures on the same day.
CWeather and climate mean the same thing; the scientist is incorrect.
DClimate only refers to temperature; since both cities were equally hot, they share the same climate.

4.11A

Identify and explain advantages and disadvantages of using Earth's renewable and nonrenewable natural resources such as wind, water, sunlight, plants, animals, coal, oil, and natural gas.

● Supporting

📘 Key Vocabulary

natural resourceA material from nature that living things use renewable resourceA resource replenished naturally, such as wind, water, and solar energy nonrenewable resourceA resource that cannot be quickly replaced, such as coal and oil fossil fuelA nonrenewable energy source formed from ancient organisms — coal, oil, and natural gas wind energyRenewable energy captured from moving air using turbines solar energyRenewable energy from sunlight captured using solar panels advantageA benefit of using a particular natural resource disadvantageA drawback or negative effect of using a particular resource identifyTo name natural resources and classify them as renewable or nonrenewable explainTo describe the advantages and disadvantages of using a resource

💡 Key Concepts

▸Renewable resources (solar, wind, water, biomass) can be replenished naturally and will not run out — their advantage is sustainability; their disadvantage may be intermittency or high initial cost.
▸Nonrenewable resources (coal, oil, natural gas) formed over millions of years and are finite — their advantage is high energy density and established infrastructure; their disadvantage is pollution and eventual depletion.
▸Texas is unique in having both significant fossil fuel resources (oil and natural gas) and abundant renewable energy potential (wind and solar) — this makes Texas central to the national energy debate.

🍎 Teacher Guide

📌Frame the discussion around Texas: Texas is both the nation's leading oil and gas producer AND its leading wind energy producer — this dual identity makes the advantages and disadvantages of both types of resources personally relevant and locally contextualized.
📌Use a structured pros-and-cons matrix: students fill in advantages and disadvantages for each resource type, then use the matrix to argue for or against a specific energy policy — connecting science content to civic decision-making.
📌Connect to careers: petroleum engineers, wind turbine technicians, solar panel installers, and environmental scientists all work in the Texas energy sector — introducing STEM careers connected to this content builds relevance.

⭐ STAAR Practice — 4.11A — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.11A

Which of the following is an example of a NONRENEWABLE natural resource?

ACoal — it is formed from ancient plant material over millions of years and cannot be replaced once burned.
BWind — it is a renewable resource continuously replenished by the Sun's heating of the atmosphere.
CSunlight — it is a renewable resource available every day from the Sun.
DTrees — they are renewable because new trees can be grown to replace ones that are cut.

Meets Grade Level TEKS 4.11A

A community is deciding between building a coal power plant or a wind farm. Which correctly identifies one advantage AND one disadvantage of wind energy compared to coal?

AAdvantage of wind: renewable and produces no air pollution. Disadvantage of wind: only generates electricity when the wind is blowing, making it less reliable than coal.
BAdvantage of wind: produces more energy per unit than coal. Disadvantage of wind: creates more air pollution than coal.
CAdvantage of coal: renewable and clean. Disadvantage of coal: too expensive to use.
DAdvantage of wind: never needs maintenance. Disadvantage of wind: wind turbines require fossil fuels to operate.

Masters Grade Level TEKS 4.11A

A student evaluates four energy sources for a Texas school: solar panels, natural gas generator, wind turbines, and oil furnace. She must choose a combination that is both reliable year-round AND reduces environmental impact. Which combination BEST meets both requirements?

ASolar panels + wind turbines — combining two renewables increases reliability (sun generates when wind doesn't) while eliminating fossil fuel pollution; energy storage can address remaining gaps.
BNatural gas + oil — using two nonrenewable sources ensures constant year-round energy availability.
CSolar panels only — solar panels generate more than enough power in Texas every day to reliably meet all energy needs.
DWind turbines + oil furnace — this combination has the lowest overall environmental impact of all options.

4.12A

Observe and describe how physical characteristics of the environment including temperature, rainfall, and light influence the distribution of organisms in an ecosystem.

📘 Key Vocabulary

distributionHow organisms are spread across an environment based on conditions physical characteristicA measurable feature of an environment such as temperature or rainfall temperatureA factor that determines where specific organisms can survive rainfallThe amount of precipitation; affects which plants and animals can live in an area lightThe amount of sunlight available in an environment; affects plant growth ecosystemA community of organisms and their nonliving environment habitatThe specific environment where an organism lives influenceTo have an effect on; environmental factors influence where organisms live observeTo notice how physical characteristics affect organism distribution describeTo explain how temperature, rainfall, and light affect where organisms live

💡 Key Concepts

▸An organism's distribution in an ecosystem is determined by physical factors — temperature, rainfall, sunlight, and soil type set the limits within which each species can survive.
▸The concept of a niche describes an organism's specific role and the conditions it needs — two species cannot occupy exactly the same niche indefinitely; one will outcompete the other.
▸Changes in physical characteristics of an environment change which organisms can live there — climate change is shifting the ranges of many species as temperatures and precipitation patterns change.

🍎 Teacher Guide

📌Use a jigsaw activity: divide students into four groups, each researching one Texas biome (Piney Woods, Hill Country, Chihuahuan Desert, Gulf Coast Marshes) — each group becomes experts on their biome's physical characteristics and organisms, then teaches the class.
📌Build the connection from abiotic to biotic explicitly: for each organism in a biome, ask "Which physical characteristic of this environment allows this organism to live here?" — this cause-and-effect chain is the core skill of the standard.
📌Connect to climate change: as temperatures and precipitation patterns shift, organism distributions are changing — species that were common in South Texas 50 years ago are now found further north — this real-world connection makes the standard consequential.

4.12B

Describe the cycling of matter and flow of energy through food webs, including the roles of the Sun, producers, consumers, and decomposers.

● Supporting

📘 Key Vocabulary

food webA complex network of interconnected food chains in an ecosystem producerAn organism that uses sunlight to make its own food consumerAn organism that eats producers or other consumers decomposerAn organism that breaks down dead organisms and returns nutrients to the soil SunThe original source of energy that enters all food webs through producers energy flowThe movement of energy from producers to consumers in a food web matter cyclingThe repeated movement of nutrients through living and nonliving parts of an ecosystem herbivoreA consumer that eats only plants carnivoreA consumer that eats only animals describeTo explain the roles of the Sun, producers, consumers, and decomposers in a food web

💡 Key Concepts

▸Food webs show that energy flows from the Sun to producers to consumers — at each level, approximately 90% of energy is lost as heat; only 10% is transferred to the next level.
▸Decomposers (bacteria, fungi) play a critical role in food webs — they break down dead organisms and waste, releasing nutrients back into the soil for producers to use, completing the nutrient cycle.
▸Matter cycles through food webs — the carbon in a plant's leaves becomes carbon in a caterpillar's body, then in a bird's feathers, then back to the soil through decomposition — the same atoms are reused.

🍎 Teacher Guide

📌Use the iron filings and sand mixture as the anchor example because it makes the most dramatic demonstration: the magnet visibly separates the two substances, showing retained properties in a way that is unmistakable.
📌Extend to a complex mixture (iron filings + sand + salt + gravel) and challenge students to design and execute a complete separation sequence using only physical methods — this engineering task applies the concept at a higher level.
📌Connect to Grade 5 conservation of mass (5.6C): substances that retain their properties in a mixture also retain their mass — the total mass of the mixture equals the sum of the parts, whether the substances are separated or combined.

⭐ STAAR Practice — 4.12B — Approaches · Meets · Masters

Approaches Grade Level TEKS 4.12B

In a forest ecosystem, mushrooms and bacteria break down a fallen dead tree. What role do these organisms play in the food web?

ADecomposers — they break down dead organisms and return nutrients to the soil so producers can use them.
BProducers — they use sunlight to make food from the dead tree.
CPrimary consumers — they eat the tree like herbivores eat living plants.
DSecondary consumers — they consume other consumers that first ate the tree.

🍎 Teacher Guide

📌Use a food web diagram with at least 8–10 organisms and have students trace multiple overlapping food chains within it — this reveals the complexity of interdependence that a simple chain cannot show.
📌Conduct a food web disruption simulation: remove one organism's card from the web and have students use string (representing food relationships) to show how the disruption travels — a physical model of cascade effects.
📌Emphasize the decomposer role explicitly: decomposers are often invisible and forgotten, but without them, nutrients would remain locked in dead matter and producers could not grow — decomposers complete the nutrient cycle.

Meets Grade Level TEKS 4.12B

A food web in a Texas grassland shows: Grass → Grasshopper → Roadrunner → Hawk; and Grass → Mouse → Hawk; and Grass → Mouse → Roadrunner. If the mouse population is drastically reduced by disease, which organisms will MOST LIKELY be affected and how?

ARoadrunner and hawk populations will decrease (less mouse prey), and grass may decrease (fewer roadrunners means more grasshoppers eating more grass).
BOnly the hawk is affected because hawks eat only mice in this food web.
CNo organisms are affected because roadrunners and hawks can eat only grasshoppers instead.
DGrass will increase because mice are no longer competing with grass for space.

Masters Grade Level TEKS 4.12B

A scientist says: 'Energy flows through a food web, but matter cycles through it.' A student challenges this, saying both energy and matter flow in the same direction. Which explanation BEST supports the scientist's claim?

AEnergy enters through producers and is lost as heat at each level — it does not return. Matter (carbon, nitrogen, etc.) is recycled by decomposers back to the soil so producers can reuse the same atoms again and again.
BBoth energy and matter flow in one direction through a food web; neither is recycled back to producers.
CEnergy cycles back to producers through decomposers; matter is lost as heat at each trophic level.
DNeither energy nor matter flows through food webs; both stay fixed in each organism.

4.13A

Investigate and describe changes in life cycles including incomplete and complete metamorphosis in insects and the stages in the life cycle of plants.

📘 Key Vocabulary

life cycleThe series of stages an organism passes through from birth to death complete metamorphosisA life cycle with four stages: egg, larva, pupa, adult incomplete metamorphosisA life cycle with three stages: egg, nymph, adult metamorphosisA dramatic change in body form that occurs during development larvaThe feeding stage of complete metamorphosis; does not resemble the adult pupaThe resting stage of complete metamorphosis; body reorganizes into adult form nymphThe juvenile stage of incomplete metamorphosis; resembles a small adult adultThe final, sexually mature stage of an insect's life cycle plant life cycleThe stages a plant goes through: seed, seedling, adult plant, flower, fruit, seed investigateTo observe and describe changes in organisms during each life cycle stage

💡 Key Concepts

▸Complete metamorphosis has four stages (egg → larva → pupa → adult) and occurs in butterflies, beetles, flies, and ants — the four stages allow each stage to exploit different food sources, reducing competition.
▸Incomplete metamorphosis has three stages (egg → nymph → adult) and occurs in grasshoppers, crickets, dragonflies, and cockroaches — nymphs look like small adults and use the same food sources.
▸Plant life cycles include seed germination → seedling growth → maturation → flowering → pollination → fruit and seed production → seed dispersal — the cycle begins again with seed dispersal.

🍎 Teacher Guide

📌Raise mealworms in the classroom through their complete metamorphosis — students observe all four stages (egg, larva, pupa, adult) over several weeks, making the abstract stages concrete and personally witnessed.
📌Use a Venn diagram to compare complete and incomplete metamorphosis: both start with an egg and end with an adult, but the middle stages differ dramatically — this comparison deepens understanding of both types.
📌Connect to plant life cycles: a seed to flowering plant mirrors the basic structure of an animal life cycle (start → growth → reproduction → next generation) — establishing that the life cycle pattern is universal across organisms.

4.13B

Investigate and identify adaptations of various organisms that allow them to survive in their ecosystem.

📘 Key Vocabulary

adaptationA structure or behavior that helps an organism survive in its environment structural adaptationA physical feature that helps an organism survive behavioral adaptationAn action or response that helps an organism survive camouflageA coloring or pattern that helps an organism blend into its surroundings mimicryWhen one organism resembles another to gain a survival advantage hibernationA behavioral adaptation in which animals conserve energy in winter migrationA behavioral adaptation in which animals travel seasonally to better conditions predatorAn organism with structural adaptations for catching prey investigateTo observe and identify adaptations that help organisms survive identifyTo name a specific adaptation and explain how it helps an organism

💡 Key Concepts

▸A structural adaptation is a physical feature that helps an organism survive — a cactus's thick, water-storing stem is a structural adaptation for desert survival; a polar bear's thick white fur is an adaptation for arctic conditions.
▸A behavioral adaptation is an action or response that helps an organism survive — migration, hibernation, nocturnal activity, and tool use are all behavioral adaptations.
▸Adaptations are the result of natural selection over many generations — individuals with traits that help them survive and reproduce pass those traits to offspring, gradually increasing the frequency of the adaptive trait.

🍎 Teacher Guide

📌Use a local Texas species case study: the Texas horned lizard has structural adaptations (spines, flat body) and behavioral adaptations (freezing motionless) that both serve the same function (predator avoidance) — using a familiar local species makes adaptations personal.
📌Introduce the distinction between structural and behavioral adaptations precisely: structural = a physical body feature; behavioral = an action or response — confusion between the two is common and worth addressing directly with clear definitions and examples.
📌Connect to evolution: adaptations accumulate over many generations because individuals with the adaptation survive and reproduce more successfully — this evolutionary framing prepares students for natural selection concepts in later grades.

Grade 5 — STAAR Year · §112.7

Students investigate physical properties of matter, forces and circuits, Earth's rotation, the water cycle, sedimentary rock formation, landform creation, ecosystems, and species adaptations. STAAR is administered this year drawing from Grades 3, 4, and 5 TEKS.

★ 8 Readiness Standards ● 5 Supporting Standards

📚

10 Key Vocabulary Words — Grade 5 (STAAR Year)

High-priority science words for STAAR success — all connected to Readiness or Supporting Standards

physical property

A measurable characteristic of matter — mass, volume, density, solubility, magnetism, conductivity — that identifies and classifies it

Matter ★ Readiness

electrical circuit

A complete, closed path through which electrical energy flows, requiring a power source, conductor, and load

Force ★ Readiness

refraction

The bending of light as it passes from one material into another at an angle

Force ★ Readiness

axis (Earth's)

The imaginary line through Earth's center from pole to pole around which Earth rotates once every ~24 hours

Earth ★ Readiness

sedimentary rock

Rock formed when layers of sediment (sand, silt, shells) are compacted and cemented together over time

Earth ★ Readiness

landform

A natural feature of Earth's surface — deltas, canyons, and sand dunes are formed by wind, water, or ice

Earth ★ Readiness

biotic factor

A living component of an ecosystem — plants, animals, fungi, and bacteria — that organisms interact with

Organisms ★ Readiness

abiotic factor

A non-living component of an ecosystem — sunlight, water, temperature, soil — that organisms depend on

Organisms ★ Readiness

density

The amount of mass in a given volume; determines whether an object sinks or floats in water

Matter ★ Readiness

solution

A mixture in which one substance (solute) is completely dissolved in another (solvent); matter is conserved

Matter ● Supporting

Grade 5 is the STAAR year — students plan and conduct both descriptive AND experimental investigations.

Graphic organizers now include cause-and-effect flow charts. Engineering design is fully integrated. Students evaluate both experimental and engineering designs.

5.1

Investigations. (A) Ask questions and define problems; (B) Plan and conduct descriptive and experimental investigations; (C) Demonstrate safe practices; (D) Use full tool list; (E) Collect observations and measurements; (F) Construct graphic organizers that show cause and effect; (G) Develop and use models or design a prototype for a solution.

📘 Key Vocabulary

experimental investigationAn investigation that tests the effect of one variable while controlling others variableA factor that can be changed or measured in an experiment controlled variableA factor kept the same in an experiment so only the test variable changes dependent variableThe variable that is measured to see the effect of the test variable independent variableThe variable that is intentionally changed in an experiment cause-and-effectA graphic organizer showing the relationship between a cause and its result hypothesisA testable prediction of what will happen in an experiment prototypeAn early model of a solution that is tested and improved engineering designThe process of identifying a problem and designing, testing, and improving a solution criteriaThe standards a solution must meet to be considered successful

💡 Key Concepts

▸Grade 5 scientists conduct experimental investigations — they test hypotheses by identifying a specific variable to change (independent variable), measuring the effect (dependent variable), and controlling all other variables.
▸Cause-and-effect graphic organizers (flow charts) help Grade 5 students trace the chain of causes and effects in complex systems — using these organizers during analysis strengthens scientific reasoning.
▸The engineering design process is fully integrated in Grade 5 — designing a simple experiment (5.7B) is an example of applying the design process to science: criteria, constraints, prototype, test, improve.

5.2

Data Analysis. (A) Identify advantages and limitations of models; (B) Analyze data by identifying any significant features, patterns, or sources of error; (C) Use mathematical calculations to compare patterns; (D) Evaluate a design or object using criteria.

📘 Key Vocabulary

dataObservations and measurements analyzed to find patterns and relationships patternA repeated or predictable trend in data or observations source of errorSomething that could make data inaccurate or misleading modelA representation of an object, process, or system limitationA weakness in a model that reduces its accuracy scaleThe proportion of a model compared to the real object or system mathematical calculationUsing numbers and operations to find patterns and relationships in data criteriaThe standards used to evaluate whether a design works as intended evaluateTo judge the quality of a design or investigation based on evidence analyzeTo carefully examine data to identify features, patterns, and errors

💡 Key Concepts

▸Strong data analysis at Grade 5 includes identifying patterns, calculating differences and averages, and recognizing sources of error — these skills transform raw numbers into scientific conclusions.
▸A model's limitations must be acknowledged — a model of the solar system cannot show true distances; a model of Earth's interior cannot show actual temperatures or pressures.
▸Evaluating an experimental design requires asking: Was only one variable changed? Were the measurements accurate? Were there enough trials to produce reliable results? These questions identify design flaws.

5.3

Explanations & Communication. (A) Develop explanations and propose solutions; (B) Communicate in a variety of settings and formats; (C) Engage respectfully in scientific argumentation using applied scientific explanations and empirical evidence.

📘 Key Vocabulary

explanationA statement that uses evidence to describe why or how something happens evidenceData and observations that support a scientific claim scientific argumentationA respectful exchange of claims backed by evidence empirical evidenceEvidence based on observations or measurements, not opinions concludeTo make a judgment based on analyzed evidence communicateTo share scientific findings clearly with an audience collaborateTo work with others toward a shared scientific goal appliedRelating to using scientific knowledge to explain a real phenomenon formatThe method or structure used to present scientific information proposeTo offer a possible explanation or solution based on evidence

💡 Key Concepts

▸At Grade 5, scientific argumentation uses empirical evidence — data collected through direct observation or measurement — to support or refute claims. Personal opinions and unsupported beliefs are not empirical evidence.
▸Applied scientific explanations connect content knowledge to a real phenomenon — 'Light refracts when it passes from air to glass because the change in medium changes the wave's speed, causing it to bend at the boundary.'
▸Proposing a solution at Grade 5 means designing an experiment or engineering solution, justifying every design choice with evidence and scientific principles.

5.4

Scientists & Society. (A) Explain how scientific discoveries and innovative solutions impact science and society; (B) Research and explore STEM careers through museums, libraries, professional organizations, private companies, online platforms, and mentors.

📘 Key Vocabulary

STEM careerA job in science, technology, engineering, or mathematics discoveryA new scientific finding that adds to our understanding innovationA new product or method that improves on what existed before impactThe effect a discovery or technology has on people and the environment societyThe community of people that benefits from scientific progress mentorAn experienced STEM professional who guides and advises others professional organizationA group of scientists or engineers who share knowledge online platformA digital resource used to explore science and engineering careers researchA careful, systematic investigation to discover new knowledge contributionWhat a scientist or engineer provides that benefits society

💡 Key Concepts

▸Science discoveries and engineering innovations continuously improve society — the discovery of electricity and development of circuits transformed communication, medicine, manufacturing, and daily life.
▸STEM careers include environmental scientists who study climate, biomedical engineers who design medical devices, data scientists who analyze large datasets, and aerospace engineers who design spacecraft.
▸Exploring STEM resources — museums, mentors, professional organizations, and online platforms — helps students connect classroom learning to real-world applications and potential career paths.

5.5A

Patterns: Identify and use patterns to explain scientific phenomena or to design solutions.

📘 Key Vocabulary

patternSomething that repeats in a predictable way day-night cycleThe daily pattern of daylight and darkness caused by Earth's rotation shadowA pattern in which shadows move as the Sun appears to move across the sky water cycleA continuously repeating pattern of evaporation, condensation, and precipitation sedimentary rockRocks formed in predictable layers through repeated deposition food webA system showing patterns of energy flow between organisms orbitThe predictable path of a planet; Earth's orbit creates seasonal patterns predictTo say what will happen next by recognizing a pattern cycleA pattern that keeps repeating, such as the water or rock cycle sequenceThe order of stages in a repeating cycle

💡 Key Concepts

▸Patterns in Earth science include sedimentary rock layers (older layers below, younger above), the water cycle (evaporation → condensation → precipitation, repeating), and landform formation (erosion and deposition creating predictable landforms).
▸Patterns in life science include biotic-abiotic relationships (organisms in the same ecosystem share similar patterns of interaction with nonliving factors) and species adaptations (related species in similar environments share adaptive patterns).
▸Using patterns to design solutions means applying observed regularities to engineer effective outcomes — knowing that specific landforms form in predictable locations (deltas at river mouths) helps engineers plan construction.

5.5B

Cause & Effect: Identify and investigate cause-and-effect relationships to explain scientific phenomena or analyze problems.

📘 Key Vocabulary

causeThe reason something happens effectThe result or outcome of a cause rotationEarth rotating on its axis causes the day-night cycle erosionThe effect of wind, water, or ice acting on Earth's surface depositionThe effect of slowing wind or water that drops sediment circuitA complete path; breaking a circuit causes lights to go out forceA push or pull that causes changes in motion or energy transfer investigateTo explore carefully to determine the cause of a phenomenon relationshipThe connection between a cause and the effect it produces graphic organizerA cause-and-effect chart used to organize relationships in data

💡 Key Concepts

▸Earth's rotation (cause) creates the day-night cycle and the apparent movement of the Sun across the sky (effects) — without rotation, one side of Earth would always be lit and the other always dark.
▸Forces acting on objects cause predictable motion changes — equal and opposite forces (balanced) produce no change; unequal forces (unbalanced) produce acceleration in the direction of the greater force.
▸In ecosystems, biotic and abiotic factor changes have cascading cause-and-effect consequences — a drought (abiotic change) reduces plant populations (biotic effect) which reduces herbivore food sources (second-order effect).

5.5C

Scale: Use scale, proportion, and quantity to describe, compare, or model different systems.

📘 Key Vocabulary

scaleThe proportion of a model compared to the real object proportionThe relationship between the sizes of different parts modelA scaled representation used to study a system or process sedimentary rockLayers that accumulate over different scales of time ecosystemA system that can be studied at different scales of organization quantityThe amount of something; affects system behavior measureTo find the actual size of something using a measuring tool relative sizeThe size of something compared to another object in a system compareTo describe how systems differ in scale or proportion describeTo explain scale and proportion in scientific models

💡 Key Concepts

▸Sedimentary rock layers represent scale in both time and thickness — a single layer may represent thousands of years of deposition; comparing layer thicknesses reveals periods of rapid versus slow sediment accumulation.
▸Ecosystem scale matters — a small pond ecosystem functions differently than a vast ocean ecosystem; the same principles of energy flow and matter cycling apply, but at vastly different scales of size and time.
▸Forces at different scales produce different results — the same amount of force produces a large acceleration in a small mass and a small acceleration in a large mass (Newton's Second Law demonstrates the role of scale).

5.5D

Systems: Examine and model the parts of a system and their interdependence in the function of the system.

📘 Key Vocabulary

systemA group of parts that work together as a whole electrical circuitA system whose components work together to allow electrical energy to flow ecosystemA system of living and nonliving things that interact water cycleA system in which water moves between Earth's surface and atmosphere componentA single piece that contributes to the function of a system interdependenceWhen parts of a system depend on each other to function modelA representation of a system showing how its parts are connected functionThe job each component performs within the system interactWhen parts of a system affect each other examineTo look carefully at how system parts work together

💡 Key Concepts

▸An electrical circuit is a system — the battery (power source), wires (conductors), switches (controls), and bulbs (loads) are interdependent components; removing any component breaks the circuit system.
▸An ecosystem is a complex system — biotic components (producers, consumers, decomposers) and abiotic components (sunlight, water, soil, temperature) are all interconnected; changing one component affects the entire system.
▸Earth's surface change system includes: weathering (breaking down rocks) → erosion (transporting sediment) → deposition (building new landforms) — these three processes form an interdependent system of change.

5.5E

Energy & Matter: Investigate how energy flows and matter cycles through systems and how matter is conserved.

📘 Key Vocabulary

energyThe ability to do work or cause change matterAnything that has mass and takes up space conservationThe principle that energy and matter cannot be created or destroyed flowThe movement of energy from one organism or place to another cycleThe repeated movement of matter through living and nonliving parts of a system food webA system showing how energy flows and matter cycles in an ecosystem circuitA system in which electrical energy flows and transforms water cycleA system showing how matter cycles between liquid, gas, and solid states transformTo change from one form of energy to another analyzeTo explain how energy flows and matter cycles through a system

💡 Key Concepts

▸Energy is conserved in circuits — electrical energy transforms to light, thermal, and/or sound energy, but the total energy output equals the total energy input (minus energy lost to heat).
▸Matter is conserved in solutions — dissolving salt in water does not destroy the salt; it is still present as dissolved ions and can be recovered by evaporating the water.
▸In the rock cycle, matter is conserved — rocks change form (igneous → sedimentary → metamorphic) but the atoms making up the rock are rearranged, not created or destroyed.

5.5F

Structure & Function: Explain the relationship between the structure and function of objects, organisms, and systems.

📘 Key Vocabulary

structureA physical feature of an organism or object with a specific form functionThe purpose or job that a structure performs adaptationA structure or behavior that helps an organism survive beakA bird structure shaped for eating a specific type of food rootA plant structure that absorbs water and anchors the plant electrical circuitA system whose components are structured to allow energy flow sedimentary rockA structure formed in layers; each layer tells the story of its formation ecosystemA system whose structure depends on the functions of producers, consumers, and decomposers relationshipThe connection between how a structure is shaped and what it does analyzeTo study the relationship between structure and function in organisms and objects

💡 Key Concepts

▸Species adapt structures to their specific environments — animals living in the same environment but eating different foods have beaks, teeth, or claws shaped for their specific diet (structure-function relationship).
▸Sedimentary rock's layered structure reflects its function as an environmental record — each layer was deposited under specific conditions, and the sequence of layers tells the story of changing environments over time.
▸The structure of a complete electrical circuit determines its function — components arranged in series (one path) versus parallel (multiple paths) behave differently, demonstrating how structure determines system function.

5.5G

Stability & Change: Explain how factors or conditions impact stability and change in objects, organisms, and systems.

📘 Key Vocabulary

stableRemaining the same under normal conditions changeBecoming different; ecosystems and Earth's surface change due to various factors ecosystemA system that is stable or changes based on biotic and abiotic conditions erosionA factor that slowly changes Earth's surface rapid changeA sudden change such as a volcanic eruption that quickly alters a system biotic factorA living component of an ecosystem that can affect stability abiotic factorA nonliving component of an ecosystem that can affect stability forceA factor that can change an object's motion or transform energy predictTo say how a change in conditions will affect a system analyzeTo explain how factors cause systems to change or remain stable

💡 Key Concepts

▸Healthy ecosystems are stable — when biotic and abiotic factors stay within their natural range, populations remain in balance; disruptions (pollution, invasive species, habitat destruction) destabilize the system.
▸Earth's surface is in constant slow change — erosion, deposition, and tectonic activity continuously reshape landforms over millions of years; this is stable change that maintains the rock cycle.
▸Electrical circuits are stable when all components are connected and functioning — removing a component (opening a switch) changes the circuit from stable (current flowing) to unstable (no current).

5.6A

Compare and contrast matter based on measurable, testable, or observable physical properties, including mass, magnetism, relative density (sinking/floating using water as a reference), physical state (solid, liquid, gas), volume, solubility in water, and ability to conduct or insulate thermal and electric energy.

★ Readiness

📘 Key Vocabulary

physical propertyA measurable or observable characteristic of matter massThe amount of matter in an object, measured with a balance volumeThe amount of space a substance takes up densityThe amount of mass in a given volume; determines sinking or floating magnetismThe property of being attracted to a magnet solubilityThe ability of a substance to dissolve in water conductorA material that allows thermal or electrical energy to pass through insulatorA material that blocks the transfer of thermal or electrical energy physical stateThe form matter takes: solid, liquid, or gas relative densityDensity compared to water; determines if an object sinks or floats

💡 Key Concepts

▸The seven physical properties in TEKS 5.6A form a comprehensive toolkit for identifying and classifying matter: mass (amount of matter), volume (space occupied), density (mass per volume), magnetism (attraction to magnets), physical state (solid/liquid/gas), solubility (dissolves in water), and conductivity (allows energy transfer).
▸Density is the key property for sinking and floating — objects with density less than 1 g/cm³ float in water (water's density); objects with density greater than 1 g/cm³ sink; this is called relative density.
▸Conductors and insulators are classified by their ability to transfer thermal or electrical energy — metals are generally conductors; wood, rubber, plastic, and glass are insulators — this property is critical for electrical safety.

🍎 Teacher Guide

📌Use the multi-property identification framework: test each unknown substance for all seven properties from TEKS 5.6A, record results in a property matrix, and use the matrix to identify the substance — this systematic approach models how scientists identify unknowns.
📌Emphasize relative density as different from mass: use two same-sized blocks of wood and metal to show that the metal is denser even if the wood block is larger — density is mass per volume, not just mass, and this distinction is a frequent STAAR misconception.
📌Connect to STAAR preparation: this is the highest-weight Readiness Standard in Grade 5 science — build multiple opportunities to practice multi-property comparisons in both investigation and written scenario formats throughout the year.

⭐ STAAR Practice — 5.6A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.6A

A student places a piece of wood and a metal spoon into a container of water. The wood floats and the spoon sinks. Which physical property is being compared?

ARelative density — the wood is less dense than water (floats) and the metal spoon is more dense than water (sinks).
BSolubility — materials that dissolve in water sink; those that don't dissolve float.
CMagnetism — non-magnetic materials float; magnetic materials sink.
DMass — heavier objects always sink and lighter objects always float.

Meets Grade Level TEKS 5.6A

A student tests an unknown solid and finds: it is shiny silver, attracted to a magnet, sinks in water, and conducts electricity. Which combination of physical properties did she observe?

APhysical state (solid), magnetism (attracted to magnet), relative density (sinks — denser than water), and electrical conductivity (conducts electricity).
BSolubility, color, magnetism, and mass.
CVolume, temperature, flexibility, and transparency.
DChemical reactivity, magnetism, density, and state of matter.

Masters Grade Level TEKS 5.6A

A student tests two unknown solids: Solid A dissolves in water, does not sink, is not attracted to a magnet, and insulates electricity. Solid B does not dissolve, sinks in water, is attracted to a magnet, and conducts electricity. Which conclusion is BEST supported?

ASolid A and Solid B are different substances — they differ in solubility, relative density, magnetism, and electrical conductivity, which together strongly identify them as distinct materials.
BSolid A and Solid B are the same substance in different states — one is solid and one is liquid.
COnly magnetism can reliably distinguish two unknown substances; the other properties are unreliable.
DPhysical properties cannot identify substances; chemical tests are always required.

5.6B

Demonstrate and explain that some mixtures maintain physical properties of their substances such as iron filings and sand or sand and water.

● Supporting

📘 Key Vocabulary

mixtureA combination of two or more substances that each keep their own properties physical propertyA characteristic of matter that is retained in a mixture iron filingsTiny pieces of iron; magnetic property retained when mixed with sand sandGranular particles; retain their size and texture in a mixture separateTo divide a mixture into its component parts using physical methods magnetismA property used to separate iron filings from sand in a mixture filtrationA method of separating particles from a liquid using a filter evaporationA method of separating dissolved substances from water demonstrateTo show that substances in a mixture keep their individual properties explainTo describe why substances in a mixture can be separated using their properties

💡 Key Concepts

▸In a mixture, each substance retains its original physical properties — this is what makes mixtures different from compounds, where substances chemically combine and lose their individual properties.
▸Because substances in a mixture retain their properties, they can be separated by physical methods — a magnet separates iron from sand; filtration separates sand from water; evaporation separates dissolved salt from water.
▸Iron filings and sand is the classic mixture example: visually inseparable, but magnetically separable — the iron retains its magnetic property even when thoroughly mixed with the non-magnetic sand.

🍎 Teacher Guide

📌Anchor the lesson with the iron filings and sand demonstration — run a magnet through the mixture and watch the iron filings leap out while the sand stays behind, then ask students to explain why the separation worked using what they know about each substance's properties.
📌Extend to a multi-step separation challenge: present a mixture of iron filings, sand, and salt, and have students design a sequence of separation steps (magnet → filter → evaporation) before testing — requiring students to predict which property each step exploits makes the retained-properties concept explicit and rigorous.
📌Connect directly to STAAR: this Supporting Standard frequently appears alongside 5.6A (physical properties) on STAAR, so use the mixture investigation as a review opportunity — after separating components, have students measure and record a physical property of each recovered substance to reinforce that properties are unchanged by mixing.

⭐ STAAR Practice — 5.6B — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.6B

A student mixes iron filings and sand together in a bowl. She moves a magnet through the mixture. What happens?

AOnly the iron filings are attracted to the magnet — iron retains its magnetic property even when mixed with sand.
BBoth iron filings and sand are attracted to the magnet because mixing changes their properties.
CNeither material is attracted because mixing destroys the properties of both substances.
DThe sand is attracted first because it is lighter than the iron filings.

Meets Grade Level TEKS 5.6B

A student mixes sand, water, and sugar together. She wants to separate all three substances. Which combination of methods would work BEST, and why?

AFiltration separates sand from the water-sugar mixture (sand particles too large to pass through filter); then evaporation separates sugar from water (water evaporates, sugar crystals remain) — each method exploits a retained physical property.
BA magnet separates all three substances because mixing makes them all slightly magnetic.
COnly filtration is needed — sand, water, and sugar will all separate through a filter at different speeds.
DThe mixture cannot be separated because combining substances permanently changes their properties.

Masters Grade Level TEKS 5.6B

A student mixes four substances: iron filings, salt, sand, and pebbles. She wants to recover all four separately using only physical methods. Which sequence of steps would work BEST and why?

AStep 1: magnet removes iron filings (magnetic property); Step 2: sieve with large holes separates pebbles from sand+salt (size property); Step 3: add water and filter — sand stays on filter (particle size), salt dissolves; Step 4: evaporate water to recover salt crystals (boiling point property).
BStep 1: add water to dissolve everything; Step 2: filter to collect all four; Step 3: use a magnet on the dried residue.
CUse only a magnet — after enough passes, all four substances will separate.
DThe four substances cannot be separated because they have too many different properties.

5.6C

Compare the properties of substances before and after they are combined into a solution and demonstrate that matter is conserved in solutions.

● Supporting

📘 Key Vocabulary

solutionA mixture in which one substance dissolves completely in another soluteThe substance that dissolves in a solution solventThe substance in which a solute dissolves dissolveThe process in which a solute breaks apart and mixes into a solvent conservation of matterThe principle that the total amount of matter does not change in a solution massThe amount of matter in a substance, measured before and after forming a solution propertyA characteristic of a substance that may change when forming a solution compareTo describe how the properties of substances change when combined into a solution demonstrateTo show that the total mass of a solution equals the mass of the solute plus solvent before and afterComparing measurements to show that matter is conserved in a solution

💡 Key Concepts

▸When a substance dissolves in water to form a solution, the solute's mass does not disappear — it is still present as dissolved particles, just too small to see; the total mass of the solution equals the sum of solute + solvent masses.
▸Comparing properties before and after dissolving shows that some properties change (visibility, state) while the mass is conserved — salt tastes salty in water, showing the salt is still present despite being invisible.
▸Solutions are different from mixtures of undissolved particles — salt water is a solution (the salt fully dissolves); muddy water is a mixture (the soil particles are suspended but not dissolved).

🍎 Teacher Guide

📌Design a mass conservation verification lab: students weigh dry salt, weigh water, mix them in a sealed container, and weigh the solution — the equal masses before and after provide the empirical evidence for the law.
📌Address the "disappearing matter" misconception directly: many students think dissolved solids disappear — recovering the salt by evaporating the solution and weighing it against the original amount provides concrete refutation.
📌Connect to real-world chemistry: conservation of mass is why chemists balance chemical equations — the same number of atoms must appear on both sides of the equation because matter cannot be created or destroyed.

⭐ STAAR Practice — 5.6C — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.6C

A student dissolves 5 grams of salt into 100 grams of water. What is the total mass of the salt water solution?

A105 grams — the total mass equals the mass of the salt plus the mass of the water because matter is conserved.
B100 grams — the salt disappeared when it dissolved, so only the water's mass remains.
C95 grams — some mass is lost as heat when salt dissolves in water.
D110 grams — dissolving creates new particles, adding to the total mass.

Meets Grade Level TEKS 5.6C

Before dissolving: a cup of water has a mass of 200 g and a sugar cube has a mass of 10 g. After dissolving, a student measures the solution and finds it has a mass of 208 g. What most likely explains the 2-gram difference?

ASome water evaporated during the dissolving process, reducing the total mass — if no water had evaporated, the solution would have been 210 g.
BSugar was destroyed during dissolving, which reduced the mass from 210 g to 208 g.
CThe balance was broken, so the measurement is meaningless.
DDissolving always reduces mass by exactly 2 grams because some matter is converted to energy.

Masters Grade Level TEKS 5.6C

A student compares a mixture and a solution. She mixes sand in water (mixture) and salt in water (solution). She filters both: sand is collected on the filter paper; the salt water passes through. She then evaporates both filtrates: the sand water leaves nothing; the salt water leaves white crystals. Which conclusion BEST demonstrates conservation of matter in the solution?

AThe salt crystals recovered after evaporation prove that the salt's mass was conserved in the solution — it was present as dissolved particles even though invisible; the total mass of salt + water before dissolving equals the mass of the solution.
BThe sand was conserved because it was visible in the mixture; the salt was not conserved because it disappeared when dissolved.
CConservation of matter only applies to mixtures, not solutions, because solutions involve a chemical change.
DThe mass of the salt crystals recovered will always be greater than the original mass because evaporation adds mass.

5.7A

Investigate and explain how equal and unequal forces acting on an object cause patterns of motion and transfer of energy.

● Supporting

📘 Key Vocabulary

forceA push or pull that can cause motion or transfer energy equal forcesTwo forces of the same magnitude acting in opposite directions; no change in motion unequal forcesForces that are not balanced; cause a change in motion balanced forcesEqual forces that result in no change in an object's motion unbalanced forcesUnequal forces that cause an object to accelerate or change direction motionThe change in position of an object resulting from unbalanced forces energy transferThe movement of energy from one object to another when forces act patternA predictable relationship between forces and the resulting motion investigateTo test how equal and unequal forces affect an object's motion explainTo describe how the balance of forces determines an object's motion

💡 Key Concepts

▸Balanced forces (equal forces in opposite directions) produce no change in motion — an object at rest stays at rest; an object moving at constant velocity continues moving at that velocity.
▸Unbalanced forces cause acceleration — the object changes speed, direction, or both in the direction of the greater force; the greater the unbalanced force, the greater the acceleration.
▸Forces and energy transfer are connected — when unbalanced forces cause motion, the moving object carries kinetic energy that can be transferred during collisions, demonstrating the link between force, motion, and energy.

🍎 Teacher Guide

📌Use a force balance activity: students push on each side of a book with equal and unequal forces using spring scales, directly reading the force values while observing the motion outcome — this quantitative approach makes balanced vs. unbalanced forces precise.
📌Build a free body diagram practice: for every force scenario presented, students draw the object and label all forces with arrows pointing in the direction of each force and labeled with the approximate magnitude — this visual tool builds force analysis skills.
📌Connect to Newton's laws: balanced forces = Newton's First Law (no acceleration); unbalanced forces = Newton's Second Law (acceleration in the direction of net force) — naming the laws connects Grade 5 investigation to the formal science they will encounter in middle school.

⭐ STAAR Practice — 5.7A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.7A

Two students push a box from opposite sides with equal force. What happens to the box?

AThe box does not move — the equal forces from both sides are balanced and produce no change in motion.
BThe box moves toward the student pushing harder.
CThe box moves forward because two forces are better than one.
DThe box spins in a circle because the forces cancel each other.

Meets Grade Level TEKS 5.7A

A diagram shows a 10 kg box. A 50 N force pushes it to the right and a 20 N friction force pushes it to the left. What is the net force on the box, and what will the box do?

ANet force = 30 N to the right — the unbalanced forces cause the box to accelerate to the right.
BNet force = 70 N to the right — forces add together when acting on the same object.
CNet force = 30 N to the left — friction is always stronger than an applied force.
DNet force = 0 N — the forces are balanced because both are pushing on the box.

Masters Grade Level TEKS 5.7A

A student investigates forces on a toy car: Trial 1 — 8 N forward, 8 N friction backward (car moves at constant speed). Trial 2 — 12 N forward, 8 N friction backward (car speeds up). Trial 3 — 4 N forward, 8 N friction backward (car slows down). Which pattern do the data show about forces and motion?

ABalanced forces (equal in opposite directions) produce constant motion; unbalanced forces with greater forward force produce acceleration; unbalanced forces with greater backward force produce deceleration — the direction of the net force determines how motion changes.
BMore total force always produces faster motion, regardless of direction.
CFriction is the only force that matters in determining motion — applied force has no effect.
DAll three trials show the same motion because the friction force is constant throughout.

5.7B

Design a simple experimental investigation that tests the effect of force on an object in a system such as a car on a ramp or balloon rocket on a string.

● Supporting

📘 Key Vocabulary

experimental investigationAn investigation testing the effect of one variable on a system variableA factor that is changed or measured in an experiment forceA push or pull applied to an object in an experiment systemThe object and conditions tested in an investigation rampA surface used to apply force to a car in an investigation balloon rocketA system used to test how force affects motion on a string designTo plan an investigation including materials, procedure, and measurements criteriaThe standards the investigation must meet to be valid and fair dataMeasurements collected to show the effect of force in an experiment evidenceData used to support conclusions about how force affects an object

💡 Key Concepts

▸A fair test requires identifying and controlling variables — in testing the effect of ramp angle on car speed, the car, surface material, and measurement method must stay the same; only the angle changes.
▸Good experimental design includes: a clear hypothesis, identification of independent and dependent variables, controlled variables, adequate number of trials, and a plan for data collection and analysis.
▸The investigation results should clearly show whether force (the independent variable) affected the object's behavior in the system (the dependent variable) — tables and graphs help present this relationship clearly.

🍎 Teacher Guide

📌Teach the difference between descriptive investigations (observe and record without testing a hypothesis) and experimental investigations (test the effect of one variable) explicitly at Grade 5 — students must be able to identify which type an investigation is and design accordingly.
📌Require a written experimental design plan before any investigation begins: hypothesis, independent variable, dependent variable, controlled variables, materials list, procedure — the plan is as important as the data collection.
📌Connect to STAAR: STAAR experimental design questions ask students to identify flaws in given designs or choose the best design from options — give students practice evaluating designs written by a fictional student, not just creating their own.

⭐ STAAR Practice — 5.7B — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.7B

A student wants to test whether the angle of a ramp affects how far a car rolls after leaving the ramp. Which is the BEST experimental design?

AChange only the ramp angle for each trial while keeping the same car, surface, and starting position — this tests only one variable at a time.
BChange the ramp angle AND use different cars for each trial to test multiple variables at once.
CRoll the car without a ramp and compare it to rolling with a ramp at one angle only.
DAsk a classmate to push the car differently for each angle to see if it makes a difference.

Meets Grade Level TEKS 5.7B

A student designs an experiment to test how the length of a balloon rocket's string affects how far the rocket travels. She identifies: the length of string (variable she changes), the distance the rocket travels (variable she measures), and the same balloon size, same amount of air, and same starting position (variables she controls). Which identifies the correct roles of each variable?

AString length is the independent variable; distance traveled is the dependent variable; balloon size, air amount, and starting position are controlled variables.
BDistance traveled is the independent variable; string length is the dependent variable; the balloon is the control.
CAll variables are controlled — there is no independent or dependent variable in this experiment.
DString length and balloon size are both independent variables; distance traveled is controlled.

Masters Grade Level TEKS 5.7B

A student's hypothesis is: 'A heavier car will travel farther down a ramp than a lighter car.' She rolls three cars of different masses down the same ramp five times each and records the distance. Her data shows the LIGHTER car consistently traveled farthest. Which BEST evaluates the outcome?

AThe data does NOT support the hypothesis — the evidence shows that lighter cars travel farther; the hypothesis should be revised to state that lighter objects experience greater acceleration from the same gravitational force, resulting in greater speed and distance.
BThe experiment is invalid because the hypothesis was not supported — an unsupported hypothesis means the investigation was conducted incorrectly.
CThe hypothesis is still correct because five trials are not enough data to draw a conclusion.
DThe data is incorrect — heavier cars must always travel farther based on scientific laws.

5.8B

Demonstrate that electrical energy in complete circuits can be transformed into motion, light, sound, or thermal energy and identify the requirements for a functioning electrical circuit.

★ Readiness

📘 Key Vocabulary

electrical circuitA complete, closed path through which electrical energy flows complete circuitA circuit with no gaps; allows electrical energy to flow open circuitA circuit with a gap; electrical energy cannot flow electrical energyEnergy carried by moving electrons through a circuit transformationThe change of electrical energy into another form light energyA form of energy produced when electrical energy flows through a bulb thermal energyA form of energy (heat) released as electrical energy flows through resistors sound energyA form of energy produced when electrical energy powers a speaker motionMovement produced when electrical energy powers a motor conductorA material that allows electrical energy to flow through a circuit

💡 Key Concepts

▸A complete (closed) circuit requires four components: a power source (battery), conductors (wires), a load (bulb, motor, or buzzer), and a complete unbroken path — removing any component opens the circuit and stops current flow.
▸Electrical energy transforms into other forms in a circuit — a light bulb transforms electrical to light AND thermal energy; a motor transforms electrical to mechanical energy; a speaker transforms electrical to sound energy.
▸Series and parallel circuits behave differently — in a series circuit, current follows one path and all components must work for any to work; in a parallel circuit, current follows multiple paths and components work independently.

🍎 Teacher Guide

📌Use an explicit circuit diagram approach: students draw schematic diagrams of their circuits before building them, then check whether their built circuit matches the diagram — this develops engineering precision and spatial reasoning.
📌Introduce series vs. parallel as a design variable: building both types with the same bulbs allows students to discover that parallel circuits maintain brightness while series circuits dim with each added bulb — the data motivates understanding the structural difference.
📌Connect to STAAR: this is a Readiness Standard — circuit questions on STAAR often present a diagram and ask students to predict what happens when a component is added, removed, or changed — practice this specific question format repeatedly.

⭐ STAAR Practice — 5.8B — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.8B

A student builds a simple circuit with a battery, two wires, and a light bulb. The bulb glows. She then disconnects one wire. What happens and why?

AThe bulb stops glowing because the circuit is now open — electrical energy can only flow through a complete, unbroken path.
BThe bulb continues to glow because the battery still has energy stored inside it.
CThe bulb glows brighter because less resistance is in the circuit with only one wire.
DThe bulb flickers because the disconnected wire creates a short circuit.

Meets Grade Level TEKS 5.8B

A student builds a circuit with a battery, wires, and a motor. The motor spins. She replaces the motor with a buzzer. The buzzer makes sound. She then replaces the buzzer with a light bulb. The bulb glows. What do all three observations demonstrate?

AElectrical energy can be transformed into different forms of energy — motion (motor), sound (buzzer), and light (bulb) — depending on the load connected in the complete circuit.
BThe battery creates different types of energy automatically depending on what is connected to it.
CEach device uses a different type of energy, not electrical energy, to operate.
DOnly light bulbs can work in a complete circuit; motors and buzzers require incomplete circuits.

Masters Grade Level TEKS 5.8B

A student builds a series circuit with a battery and three light bulbs. All three glow. She then unscrews Bulb 2. Bulbs 1 and 3 also go out. She rebuilds the circuit but connects the bulbs in parallel instead. She unscrews Bulb 2 again. Bulbs 1 and 3 continue to glow. Which conclusion BEST explains the difference?

AIn a series circuit, all components share one path — removing one component breaks the entire circuit. In a parallel circuit, each component has its own path — removing one does not break the others.
BParallel circuits use more battery power, which is why bulbs stay on when one is removed.
CSeries circuits are always brighter because they concentrate all electrical energy in one path.
DRemoving a bulb in a parallel circuit sends extra electricity to the remaining bulbs, which is why they stay on.

5.8C

Demonstrate and explain how light travels in a straight line and can be reflected, refracted, or absorbed.

★ Readiness

📘 Key Vocabulary

lightA form of electromagnetic energy that travels in straight lines reflectionThe bouncing of light off a surface refractionThe bending of light as it passes from one medium to another absorptionThe taking in of light energy by a material; absorbed light is not reflected straight lineThe path light travels when it is not reflected or refracted transparentA material that allows light to pass through without bending opaqueA material that absorbs or reflects all light; no light passes through translucentA material that allows some light to pass through but scatters it prismA transparent object that refracts white light into a spectrum of colors demonstrateTo show experimentally how light travels and can be reflected, refracted, or absorbed

💡 Key Concepts

▸Light travels in straight lines — this explains why objects cast shadows (the light cannot bend around an opaque object), why you can see around corners only with mirrors, and why we see laser beams as straight.
▸When light hits a surface, it can be reflected (bounces back), refracted (bends as it enters a new medium), or absorbed (converted to thermal energy) — the material and angle determine which occurs.
▸Refraction explains many observations — a straw appears bent in a glass of water (light bends as it crosses the water-air boundary); rainbows form when light refracts through water droplets and separates into colors.

🍎 Teacher Guide

📌Use a laser pointer to demonstrate that light travels in a straight line (visible in a slightly dusty room or through fog spray) — then use mirrors and prisms to demonstrate reflection and refraction with the same light source.
📌Build a periscope as an engineering application of reflection — students design, build, and troubleshoot a simple periscope, applying their knowledge that mirrors reflect light at equal angles.
📌Connect to STAAR: refraction questions frequently use the "pencil in water" scenario or "rainbow formation" — give students explicit practice explaining these specific phenomena using the vocabulary of refraction and change in medium.

⭐ STAAR Practice — 5.8C — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.8C

A student shines a flashlight at a wall in a dark room. The beam travels in a straight line from the flashlight to the wall. A classmate then holds an opaque book in the beam's path. What will happen?

AA shadow will form on the wall because the opaque book blocks the light, which was traveling in a straight line.
BThe light will bend around the book and continue to illuminate the wall behind it.
CThe light will slow down when it hits the book and arrive at the wall with less brightness.
DThe light will be reflected backward toward the flashlight.

Meets Grade Level TEKS 5.8C

A student places a pencil in a glass of water and notices the pencil appears bent at the water's surface. She removes the pencil — it is straight. Which best explains what she observed?

ARefraction — light bends as it passes from the air into the water (or water into air) because its speed changes at the boundary between the two media.
BReflection — the water reflects the pencil's image at an angle, making it look bent.
CAbsorption — the water absorbs part of the light, causing the pencil to appear shorter and bent.
DThe pencil actually bent slightly due to water pressure, then straightened when removed.

Masters Grade Level TEKS 5.8C

A student investigates light with three materials: a glass window (transparent), a frosted glass panel (translucent), and a wooden board (opaque). She shines a flashlight at each. Which correctly describes what happens to the light for each material and why?

AGlass: most light passes through (transmitted) because glass allows light to travel through it; frosted panel: some light passes through but scatters (partly transmitted, partly absorbed/reflected); wood: no light passes through — it is all reflected or absorbed.
BGlass: all light is reflected because glass is shiny; frosted panel: all light is absorbed; wood: all light passes through because it has pores.
CAll three materials allow the same amount of light to pass through because the flashlight's energy level is the same.
DGlass: all light is absorbed and converted to heat; frosted panel: light is reflected back to the source; wood: light passes through slowly.

5.9A

Demonstrate that Earth rotates on its axis once approximately every 24 hours and explain how that causes the day/night cycle and the appearance of the Sun moving across the sky, resulting in changes in shadow positions and shapes.

★ Readiness

📘 Key Vocabulary

rotationThe spinning of Earth on its axis, completing one turn every approximately 24 hours axisThe imaginary line through Earth from pole to pole around which Earth rotates day-night cycleThe daily pattern of daylight and darkness caused by Earth's rotation shadowA dark area formed when Earth or an object blocks sunlight; shadow position changes with rotation apparent motionThe way the Sun appears to move across the sky as Earth rotates sunriseWhen the Sun first appears above the horizon as Earth rotates toward the Sun sunsetWhen the Sun disappears below the horizon as Earth rotates away from the Sun 24 hoursThe time it takes Earth to complete one full rotation on its axis demonstrateTo show through a model how Earth's rotation causes the day-night cycle explainTo describe the relationship between Earth's rotation and changes in shadow

💡 Key Concepts

▸Earth completes one rotation on its axis every approximately 24 hours — this rotation causes day (when your location faces the Sun) and night (when it faces away), creating the daily cycle of light and darkness.
▸As Earth rotates, the Sun appears to move across the sky from east to west — this is an apparent motion caused by Earth's rotation, not by the Sun actually moving around Earth.
▸Shadow length and direction change predictably as Earth rotates — shadows are longest in the morning and evening (Sun low in sky) and shortest at noon (Sun highest in sky) — this predictable pattern is used in sundials.

🍎 Teacher Guide

📌Use a kinesthetic rotation model: shine a flashlight (Sun) at a slowly rotating student (Earth) — observe which side is lit (day) and which is dark (night), then mark one spot on the "Earth" student and count how many rotations equal one day.
📌Shadow investigation is the primary investigation for this standard: place a meter stick vertically in direct sunlight and measure the shadow length at 8 AM, 10 AM, 12 PM, 2 PM, and 4 PM — the data shows both that shadow direction changes (apparent Sun movement) and that shadow length changes (Sun angle change) as Earth rotates.
📌Connect to STAAR: this is a Readiness Standard — STAAR questions often present shadow diagrams at different times and ask students to identify the time or direction — give extensive practice interpreting shadow diagrams as a specific skill.

⭐ STAAR Practice — 5.9A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.9A

Why does it appear that the Sun moves across the sky from east to west each day?

AEarth rotates from west to east on its axis once every 24 hours, making the Sun appear to move from east to west across the sky.
BThe Sun orbits Earth once every 24 hours, moving from east to west across the sky.
CEarth's revolution around the Sun causes the Sun to appear in different positions each hour of the day.
DThe Sun moves from east to west because it is attracted by Earth's magnetic poles.

Meets Grade Level TEKS 5.9A

A student places a stick vertically in the ground on a sunny day and marks the tip of its shadow at 8 AM, 12 PM, and 4 PM. She notices the shadow moves and changes length throughout the day. Which best explains both observations?

AEarth's rotation changes the Sun's apparent position in the sky — the shadow's direction changes as the Sun appears to move, and the shadow is shortest at noon when the Sun is highest (most direct angle).
BThe Sun actually moves across the sky, pushing the shadow in the opposite direction throughout the day.
CThe stick moves slightly as the ground warms and cools, changing the shadow's position.
DThe shadow only changes length, not direction — Earth's rotation has no effect on shadow direction.

Masters Grade Level TEKS 5.9A

A student in Houston records sunrise and sunset times for one week in June and one week in December. She finds June has about 14 hours of daylight and December has about 10 hours. She also notes that shadow lengths at noon are shorter in June than in December. Which explanation accounts for BOTH observations using only Earth's rotation and revolution?

AEarth's axial tilt combined with its revolution around the Sun causes the Northern Hemisphere to face the Sun more directly and for more hours in June (producing longer days and shorter noon shadows) than in December (shorter days, longer noon shadows). Earth's daily rotation produces the cycle of day and night within each season.
BEarth rotates faster in June than December, causing longer days; faster rotation also causes the Sun to appear higher in the sky, creating shorter shadows.
CThe Sun produces more light energy in June, which causes both longer days and shorter shadows.
DEarth's revolution around the Sun is responsible for day length changes, but shadow length differences are caused only by Earth's rotation speed.

5.10A

Explain how the Sun and the ocean interact in the water cycle and affect weather.

● Supporting

📘 Key Vocabulary

water cycleThe continuous movement of water between Earth's surface and the atmosphere evaporationThe change of liquid ocean water to water vapor using solar energy condensationThe change of water vapor to liquid water as it cools in the atmosphere precipitationWater that falls from clouds as rain or snow, returning water to Earth SunThe energy source that drives evaporation and powers the water cycle oceanThe largest reservoir of water on Earth; the main source of evaporation atmosphereThe layer of gas where water vapor rises and condenses into clouds weatherThe atmospheric conditions affected by the water cycle interactHow the Sun and ocean work together to drive the water cycle explainTo describe how the Sun and ocean interact to produce weather through the water cycle

💡 Key Concepts

▸The Sun provides the energy for evaporation — solar radiation heats ocean water, converting liquid water to water vapor that rises into the atmosphere; without the Sun, evaporation would stop and the water cycle would halt.
▸Ocean interactions drive global weather — the ocean absorbs and releases heat slowly, moderating coastal temperatures; ocean evaporation provides the moisture that falls as precipitation across continents.
▸Changes in ocean temperature affect weather patterns — El Niño events (warmer Pacific Ocean) disrupt normal weather patterns, causing drought in some regions and floods in others, showing how ocean-atmosphere interactions affect weather globally.

🍎 Teacher Guide

📌Use the Gulf of Mexico as the primary Texas example: warm Gulf water evaporates, moisture-laden air moves inland, and afternoon thunderstorms are the result — making the Sun-ocean-weather chain locally real and personally observable.
📌Connect to severe weather: hurricanes form over warm ocean water where evaporation is most intense — understanding the Sun-ocean interaction explains why hurricane season peaks in late summer when ocean temperatures are highest.
📌Differentiate from the Grade 4 water cycle standard: Grade 4 establishes the cycle's mechanics; Grade 5 adds the specific interaction between the Sun and ocean and its effect on weather patterns — make this progression explicit to students.

⭐ STAAR Practice — 5.10A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.10A

Which best describes the role of the Sun in the water cycle?

AThe Sun provides the thermal energy that causes water to evaporate from oceans, lakes, and rivers — without the Sun, evaporation would not occur and the water cycle would stop.
BThe Sun pulls water vapor upward into the atmosphere using gravity.
CThe Sun creates new water molecules from hydrogen and oxygen in the atmosphere.
DThe Sun causes precipitation by making clouds heavy enough to release rain.

Meets Grade Level TEKS 5.10A

Coastal cities often experience afternoon thunderstorms in summer because the ocean heats up during the day, evaporates water vapor into the air, and the vapor rises, cools, and condenses into clouds. Which interaction is MOST directly producing these storms?

AThe Sun heats the ocean (abiotic interaction); ocean water evaporates (Sun-ocean interaction); water vapor condenses in the cooler upper atmosphere to form clouds and precipitation — demonstrating how the Sun and ocean interact to affect weather.
BThe Moon's gravitational pull on the ocean causes water to evaporate each afternoon.
CWind alone causes the afternoon storms — the Sun and ocean play no role in storm formation.
DThe ocean cools during the day, which causes water vapor in the air to condense immediately into rain.

Masters Grade Level TEKS 5.10A

Scientists find that El Niño events — periods when Pacific Ocean surface temperatures are warmer than normal — cause drought in some regions and flooding in others worldwide. Which explanation BEST connects the Sun, ocean, and weather interactions described in this standard?

AWarmer Pacific Ocean temperatures (caused by increased solar absorption) increase evaporation rates, adding more water vapor to the atmosphere and shifting global wind and precipitation patterns — demonstrating that changes in Sun-ocean interactions have cascading effects on weather worldwide.
BEl Niño is caused only by changes in the Sun's energy output, which directly alters global temperatures without involving the ocean.
CEl Niño affects only the Pacific Ocean countries — the Sun-ocean interaction is too weak to influence weather in distant regions.
DIncreased ocean temperature reduces evaporation because warm water is heavier and harder to evaporate, causing drought globally.

5.10B

Model and describe the processes that led to the formation of sedimentary rocks and fossil fuels.

★ Readiness

📘 Key Vocabulary

sedimentary rockRock formed when layers of sediment are compacted and cemented together weatheringThe breaking down of rocks into sediment by water, wind, and ice erosionThe movement of sediment from one location to another depositionThe settling of sediment in layers that build up over time compactionThe squeezing of sediment layers under pressure from above cementationThe binding of sediment particles by minerals to form solid rock fossil fuelAn energy source such as coal, oil, or natural gas formed from ancient organisms coalA fossil fuel formed from compressed ancient plant material over millions of years modelA physical or visual representation of sedimentary rock formation processThe sequence of steps by which sedimentary rocks and fossil fuels form

💡 Key Concepts

▸Sedimentary rock formation follows a sequence: weathering (rock broken into particles) → erosion (particles transported) → deposition (particles settle in layers) → compaction (layers squeezed together) → cementation (minerals bind particles) → sedimentary rock.
▸Fossil fuels (coal, oil, natural gas) formed from the remains of ancient organisms compressed under sediment over millions of years — coal formed from ancient plant matter; oil and gas formed from marine microorganisms.
▸The layers of sedimentary rock preserve a historical record — lower layers are older, upper layers are younger; fossils within layers tell scientists about the organisms and environments of each time period.

🍎 Teacher Guide

📌Build a sediment column in a clear jar: shake gravel, sand, silt, and clay in water, then let it settle over several days — the layers that form represent deposition, and the order (coarsest to finest) models how sedimentary rock layers form.
📌Connect to fossil fuels explicitly: decomposed marine organisms were buried under layers of sediment and subjected to heat and pressure over millions of years — coal, oil, and natural gas are the compressed remains of ancient life, making fossil fuels literally a form of stored biological energy.
📌Connect to STAAR: this is a Readiness Standard that frequently appears with a cross-section diagram of rock layers — students must interpret the sequence of events from the diagram; give explicit practice reading geological cross-sections.

⭐ STAAR Practice — 5.10B — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.10B

Which correctly lists the steps in the formation of sedimentary rock in order?

AWeathering → Erosion → Deposition → Compaction → Cementation
BCementation → Compaction → Deposition → Erosion → Weathering
CErosion → Weathering → Compaction → Cementation → Deposition
DDeposition → Erosion → Weathering → Cementation → Compaction

Meets Grade Level TEKS 5.10B

Coal is a fossil fuel found underground. A scientist explains that coal formed from ancient swamp plants that were buried, compressed, and heated over millions of years. Which process is MOST similar to how sedimentary rock forms?

ABoth coal and sedimentary rock form when organic or inorganic material is buried, compacted under pressure, and cemented/transformed over long periods of time.
BCoal forms only from volcanic activity, which is the same process that creates igneous rock.
CSedimentary rock forms quickly from lava, while coal forms slowly from plants — the processes are entirely different.
DBoth coal and sedimentary rock form from the same material (sand and gravel) compressed underground.

Masters Grade Level TEKS 5.10B

A student examines a cliff face with five horizontal rock layers. Layer A is at the bottom with marine fossils; Layer B contains plant fossils; Layer C has no fossils; Layer D contains river sediment fossils; Layer E at the top has tree fossils. What does this sequence tell scientists about how this location changed over time?

AThe environment changed from a marine (ocean) environment → swampy/forested land → period of no life → river environment → forest, with older environments at the bottom and younger ones at the top — each layer was once at the surface when it was deposited.
BAll five layers formed at the same time in different locations and were then stacked together by earthquakes.
CLayer E is the oldest because trees are more complex than marine organisms.
DThe layers have no significance for understanding past environments because fossils can move between rock layers over time.

5.10C

Model and identify how changes to Earth's surface by wind, water, or ice result in the formation of landforms, including deltas, canyons, and sand dunes.

★ Readiness

📘 Key Vocabulary

landformA natural feature of Earth's surface created by erosion and deposition deltaA fan-shaped landform created when a river deposits sediment at its mouth canyonA deep, narrow valley carved by flowing water over long periods of time sand duneA mound of sand formed when wind deposits sand in one location erosionThe movement of rock and soil by wind, water, or ice that creates landforms depositionThe dropping of sediment that builds up to form landforms windA force that erodes and deposits sediment to form sand dunes waterA force that erodes rock to form canyons and deposits sediment to form deltas glacierA large mass of ice that erodes rock and deposits sediment to form landforms modelA physical or visual representation used to show how landforms are created

💡 Key Concepts

▸Wind, water, and ice are the three agents of erosion and deposition that create landforms — wind creates sand dunes; water creates canyons and deltas; glaciers (ice) create U-shaped valleys and moraines.
▸A delta forms where a river meets a body of standing water — the river's speed drops, it can no longer carry sediment, and it deposits the sediment in a fan-shaped pattern at its mouth.
▸A canyon forms when fast-moving water cuts downward through rock over long periods of time — the Colorado River carved the Grand Canyon over millions of years, removing layers of sedimentary rock.

🍎 Teacher Guide

📌Use the three agents (wind, water, ice) as an organizing framework and connect each to its characteristic landforms: wind → sand dunes; water → deltas and canyons; ice (glaciers) → U-shaped valleys — the agent-to-landform connection is the core knowledge structure.
📌Use a physical model or virtual simulation of delta formation: pour sediment-laden water into a standing body of water and observe the fan-shaped deposit that forms — this makes the deposition process visible and tangible.
📌Connect to STAAR: this is a Readiness Standard that appears frequently with maps or photographs of landforms asking students to identify the agent and process — practice landform identification from images as a specific skill.

⭐ STAAR Practice — 5.10C — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.10C

A river carries sediment and deposits it where it empties into the ocean. Over time, the sediment builds up into a fan-shaped landform. What landform is being described?

AA delta — formed when a river slows at its mouth and deposits its sediment load in a fan shape.
BA canyon — formed when a river cuts downward through rock over long periods.
CA sand dune — formed when wind deposits sand in a mound.
DA valley — formed when glaciers carve a U-shape through mountains.

Meets Grade Level TEKS 5.10C

The Grand Canyon in Arizona is over 1 mile deep and was carved through horizontal layers of sedimentary rock. Which agent of change most likely formed this canyon, and through which process?

AWater — the Colorado River eroded the rock over millions of years, cutting deeper and deeper through the sedimentary layers to form the canyon.
BWind — strong desert winds sandblasted the rock away over thousands of years.
CIce — glaciers carved the canyon during the last Ice Age when glaciers covered the Southwest.
DRapid change — a volcanic eruption or earthquake created the canyon suddenly in a short time.

Masters Grade Level TEKS 5.10C

A scientist compares three landforms: (1) A delta at a river's mouth. (2) A canyon in a desert. (3) Sand dunes in a coastal area. Which correctly identifies the agent of change and the process for all three?

A(1) Delta: water deposition — river slows and drops sediment; (2) Canyon: water erosion — river cuts through rock over time; (3) Sand dunes: wind erosion and deposition — wind picks up and deposits sand in mounds.
B(1) Delta: wind deposition; (2) Canyon: ice erosion; (3) Sand dunes: water deposition.
CAll three landforms are created by the same agent (water) through the same process (erosion).
D(1) Delta: ice deposition; (2) Canyon: water deposition; (3) Sand dunes: wind erosion only — no deposition.

5.11A

Investigate and identify how a series of catastrophic events in geological history caused the extinction of various organisms.

📘 Key Vocabulary

extinctionThe permanent disappearance of all members of a species catastrophic eventA sudden, large-scale event that causes mass extinction asteroid impactA collision with a large space rock that can cause mass extinction volcanic eruptionA catastrophic event that releases gases and ash that can disrupt climate geological historyThe record of major events that shaped Earth over billions of years speciesA group of organisms that can reproduce with each other mass extinctionThe rapid extinction of a large percentage of all species on Earth fossil recordThe collection of fossils that documents organisms that lived in the past investigateTo research how catastrophic events in Earth's history caused extinctions identifyTo name specific catastrophic events and explain how they led to extinctions

💡 Key Concepts

▸Mass extinctions are events in which a large percentage of all species on Earth disappeared in a geologically short time — scientists have identified five major mass extinctions in Earth's history.
▸The most famous mass extinction — the end-Cretaceous event 66 million years ago — is thought to have been caused by a massive asteroid impact combined with intense volcanic activity, which blocked sunlight and disrupted food chains globally.
▸Evidence of mass extinctions comes from the fossil record — below a certain rock layer, fossils of certain species are abundant; above that layer, they disappear — this boundary marks the extinction event.

🍎 Teacher Guide

📌Use a geological timeline: display the five mass extinctions on a scaled timeline from Earth's formation to today — showing that mass extinctions are part of Earth's regular history (though geologically infrequent) builds perspective.
📌Focus on the K-Pg (Cretaceous-Paleogene) event: the asteroid impact, volcanic activity, and global cooling that ended the dinosaurs is well-supported by multiple evidence types (iridium layer, shocked quartz, global soot layer) — this case study models how scientists build a multi-evidence conclusion.
📌Connect to current biodiversity loss: some scientists argue that human-caused extinction rates may constitute a sixth mass extinction — this connection makes geological history relevant to contemporary environmental science.

5.12A

Observe and describe how a variety of organisms survive by interacting with biotic and abiotic factors in a healthy ecosystem.

★ Readiness

📘 Key Vocabulary

ecosystemA community of organisms interacting with each other and their nonliving environment biotic factorA living component of an ecosystem such as plants, animals, and bacteria abiotic factorA nonliving component of an ecosystem such as sunlight, water, and temperature surviveTo stay alive by successfully interacting with biotic and abiotic factors healthy ecosystemAn ecosystem with stable biotic and abiotic conditions that support life organismA living thing that interacts with biotic and abiotic factors to meet its needs sunlightAn abiotic factor that provides energy for producers in an ecosystem waterAn abiotic factor that all organisms in an ecosystem depend on for survival observeTo watch and describe how organisms interact with their ecosystem describeTo explain how specific organisms use biotic and abiotic factors to survive

💡 Key Concepts

▸A healthy ecosystem requires both biotic factors (producers, consumers, decomposers) and abiotic factors (sunlight, water, soil, temperature) to be present and in balance — organisms depend on both to survive.
▸Biotic and abiotic factors interact constantly — abiotic sunlight enables biotic photosynthesis; biotic decomposers break down organic matter into abiotic nutrients that soil absorbs; the interaction is continuous.
▸Describing how an organism survives requires identifying which specific biotic and abiotic factors it depends on — a desert tortoise needs: abiotic (rocks for shelter, warm temperatures, sandy soil), biotic (cacti for food and water).

🍎 Teacher Guide

📌Use a local Texas ecosystem as the primary case study — the Edwards Aquifer ecosystem in Central Texas works exceptionally well: it has unique species (Texas blind salamander, fountain darter) that depend entirely on specific abiotic factors (water clarity, temperature, dissolved oxygen) — illustrating biotic-abiotic interdependence with scientific urgency.
📌Build a biotic-abiotic interaction web: start with one organism in the center, identify all the biotic and abiotic factors it depends on, then show how changing one factor ripples through the web — this system-thinking activity is the heart of the standard.
📌Connect to STAAR: this is a Readiness Standard appearing frequently with ecosystem diagrams and asking students to predict the effect of changing a biotic or abiotic factor — give students extensive practice with "what if" scenario questions.

⭐ STAAR Practice — 5.12A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.12A

Which of the following is a BIOTIC factor in a pond ecosystem?

AThe algae growing in the water — algae are living producers in the ecosystem.
BThe temperature of the water — temperature is a nonliving physical factor.
CThe amount of sunlight reaching the pond — sunlight is a nonliving energy source.
DThe rocks on the bottom of the pond — rocks are nonliving solid materials.

Meets Grade Level TEKS 5.12A

A student studies a healthy oak forest ecosystem. She lists: oak trees (producers), deer (consumers), squirrels (consumers), bacteria (decomposers), sunlight, rainfall, soil nutrients, and air temperature. A severe drought reduces rainfall significantly. Which BEST predicts the effect on the ecosystem?

AReduced rainfall (abiotic change) stresses oak trees (biotic), reducing food and habitat for deer and squirrels (biotic cascade), and less organic matter slows decomposer activity — the entire ecosystem is affected through biotic-abiotic interactions.
BOnly the oak trees are affected by drought; animal populations are not affected by changes in abiotic factors.
CDrought improves the ecosystem by reducing competition between organisms for water.
DDecomposers increase during drought because they feed on dead trees that dry out quickly.

Masters Grade Level TEKS 5.12A

A student compares two ponds: Pond A is healthy with diverse plants, fish, frogs, insects, and decomposers, plus clear water, moderate temperature, and high dissolved oxygen. Pond B has been polluted — many organisms have died, the water is murky and warm, and dissolved oxygen is low. Which conclusion BEST explains the difference between the two ponds?

APond A is healthy because biotic and abiotic factors are balanced — sufficient sunlight, water quality, and temperature (abiotic) support diverse producers and consumers (biotic); Pond B's altered abiotic conditions (murky water blocking sunlight, warm water holding less oxygen) disrupted the biotic community, reducing biodiversity and ecosystem health.
BThe only difference between the ponds is the number of species — the abiotic factors are irrelevant to ecosystem health.
CPond B is unhealthy only because of the biotic changes; the abiotic factors like temperature and oxygen played no role.
DBoth ponds can support the same organisms because living things adapt immediately to any change in conditions.

5.13A

Analyze the structures and functions of different species to identify how organisms survive in the same environment.

★ Readiness

📘 Key Vocabulary

structureA physical feature of an organism with a specific form functionThe job or purpose of a structure that helps an organism survive adaptationA structure or behavior that helps a species survive in its environment speciesA group of organisms with shared characteristics that can reproduce together beakA bird structure shaped for eating specific types of food in a shared environment camouflageA structural adaptation that helps an organism blend into its environment root systemA plant structure adapted for absorbing water in specific environments webbed feetA structural adaptation that helps animals swim in aquatic environments analyzeTo study the structure and function of different species to determine how they survive environmentThe shared surroundings where different species use different structures to survive

💡 Key Concepts

▸Different species living in the same environment have different structures that allow them to exploit different resources — finches with different beak shapes in the same environment eat different types of food, reducing competition.
▸Analyzing structures means identifying the form (what it looks like) and connecting it to the function (what it does to help the organism survive) — a flat, broad foot is structured for stability on wet surfaces.
▸When species share an environment, their structures are often complementary rather than identical — one species' structure exploits a resource another cannot access, allowing both to survive in the same place.

🍎 Teacher Guide

📌Use a comparative structure analysis protocol: for three species sharing the same environment, students create a table comparing specific structures, their functions, and the resource each structure helps the organism access — this systematic comparison reveals how structural differences enable coexistence.
📌Use Darwin's finches as the classic example, then extend to local Texas species — show how different warbler species in the same Texas woodland have different beak shapes and eat different insects at different heights — keeping one variable (environment) constant while comparing structures.
📌Connect to STAAR: this is a Readiness Standard — questions often present a scenario with two organisms in the same environment and ask how their different structures allow both to survive — practice this specific comparison-in-same-environment question type.

⭐ STAAR Practice — 5.13A — Approaches · Meets · Masters

Approaches Grade Level TEKS 5.13A

Two bird species live in the same forest. One has a long, thin beak and eats nectar from flowers. The other has a short, strong beak and cracks open seeds. Which best explains how both species can survive in the same environment?

AEach bird has a structure (beak shape) matched to a different food source — their different beak structures allow them to use different resources without directly competing.
BThe birds take turns using the forest — one lives there in summer and the other in winter.
CBoth birds eat the same food but the stronger bird always gets more, keeping the weaker bird thin.
DBeak shape does not affect what food a bird can eat — both birds can eat nectar and seeds equally.

Meets Grade Level TEKS 5.13A

A scientist analyzes the structures and functions of three organisms living in the same river ecosystem: a duck (webbed feet, flat bill), a heron (long legs, sharp pointed bill), and an otter (streamlined body, webbed feet, dense fur). Which correctly matches each organism's structure to its survival function?

ADuck: webbed feet for swimming, flat bill for scooping aquatic plants/invertebrates from the surface; Heron: long legs for wading in shallow water, sharp bill for spearing fish; Otter: streamlined body and webbed feet for fast swimming, dense fur for insulation in cold water.
BDuck: long legs for wading, sharp bill for catching fish; Heron: webbed feet for swimming, flat bill for scooping food; Otter: hollow bones for buoyancy, flat tail for steering.
CAll three organisms have the same structures because they live in the same river environment.
DDuck: webbed feet for climbing riverbanks; Heron: long legs for hiding among tall reeds; Otter: streamlined body for burrowing into riverbanks.

Masters Grade Level TEKS 5.13A

Scientists study a desert ecosystem with three lizard species sharing the same habitat: Species A has a wide, flat body and broad toes that press against hot rocks for heat (basking). Species B has long, slender legs and runs across loose sand. Species C has a spiny body and bright colors used for territorial defense. All three eat insects but at different times of day. Which conclusion BEST demonstrates how structural analysis reveals how these species coexist?

AEach species' unique body structures (flat body for heat absorption, long legs for sand locomotion, spines and color for defense) plus different activity times allow three species to occupy the same desert by exploiting different microhabitats, movement strategies, and defensive resources — reducing direct competition despite sharing the same ecosystem.
BThe three species cannot truly coexist — one will eventually outcompete the others and drive them extinct.
CSince all three eat insects, their structures are irrelevant — only diet determines whether species can coexist.
DStructural differences are only important for finding mates, not for determining how species survive in shared environments.

Two Authoritative References

Six Strands Across All Grade Levels

Browse TEKS by Grade Level

Kindergarten · §112.2

Grade 1 · §112.3

Grade 2 · §112.4

Grade 3 · §112.5

Grade 4 · §112.6

Grade 5 — STAAR Year · §112.7

Readiness Standards Spotlight

About the Standards & Assessment