You will learn
- Define weathering.
- Name types of weathering.
- Explain how ice breaks rock.
- Model weathering safely.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Weathering breaks rock into pieces.
- Water freezes and expands in cracks.
- Plant roots wedge rocks apart.
- Weathering is slow.
Words to know
the breaking of rock by weather and living things
changing size or shape without changing makeup
a narrow gap in rock
a small broken piece
1. Discover: The cracked path
Esi notices a tree root has lifted a paving stone and cracked it. “The root pushed the rock apart,” she says. In cold countries, water gets into cracks and freezes. “Ice takes up more space than water,” her teacher explains. “It wedges the rock open.”
Think: What other forces might break rocks?
2. Understand: Weathering
Idea 1: What is weathering?
Weathering is the slow breaking of rock into smaller fragments by weather and living things. It is physical when only size changes.
Idea 2: Agents
Water that freezes in a crack expands and splits rock. Plant roots wedge rocks apart. Strong heating and cooling make rock expand and shrink until it cracks. Wind-blown sand wears surfaces.
Idea 3: Results
Over time cliffs and boulders break into gravel, sand and eventually soil. Weathering shapes landscapes.
3. Worked examples
Example 1 (I show you): Agent
Frost.
- Water in crack.
- Freezes.
- Expands.
Answer: Ice splits rock.
Example 2 (We do it together): Agent
Roots.
- Grow in cracks.
- Push apart.
- Break.
Answer: Roots break rock.
Example 3 (You try): Result
Boulder.
Show the steps and answer
- Cracks.
- Fragments.
- Soil.
Answer: Rock becomes soil.
Did you know?
The Sphinx and many ancient monuments are being slowly worn away by wind, rain and salt.
Why this matters
Weathering shapes the land and makes the soil we grow food in.
4. Explore: Weathering model
Model freezing weathering by freezing a water-filled plastic cup of clay.
- Press clay around a small cracked stone.
- Add water to the crack.
- Freeze overnight (adult).
- Observe changes.
Think about it: what did you notice?
What did you notice? The expanding ice widened the crack.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- ___ is the breaking of rock by weather.
- A ___ is a narrow gap.
- A ___ is a small broken piece.
- ___ weathering changes size only.
Guided practice
Question 1. What is weathering?
Breaking rock.
Question 2. What breaks rock?
Ice.
Question 3. What is a crack?
Gap.
Independent practice
Level 1: Start
- What is weathering?
- What breaks rock?
- What is a crack?
- What is a fragment?
- Does it happen fast?
Level 2: Grow
- Why does ice break rock?
- Why do roots break rock?
- Why makes soil?
Level 3: Stretch
- Model freezing.
- List agents.
- Explain results.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how a rock becomes soil.
Show a sample answer
Steps.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: They weather.
Fix: It is slow.
8. Lesson summary and revision card
- I can define weathering.
- I can name types of weathering.
- I can explain how ice breaks rock.
- I can model weathering safely.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Weathering breaks rock into pieces.
- Water freezes and expands in cracks.
- Plant roots wedge rocks apart.
- Weathering is slow.
11. Next lesson
Next lesson: Erosion. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define weathering. [2 marks]
- Name three agents of weathering. [3 marks]
- Explain how freezing breaks rock. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- Breaking [1]; rock into pieces [1]
- 1 each
- Water in crack [1]; freezes and expands [1]; splits rock [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is weathering?
- What breaks rock?
- What is a crack?
- What is a fragment?
- Does it happen fast?
- Why does ice break rock?
- Why do roots break rock?
- Why makes soil?
- Model freezing.
- List agents.
Homework
Look for cracked paving or walls and sketch what caused them.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is weathering? | Breaking rock. | 1 |
| 2. What breaks rock? | Ice. | 1 |
| 3. What is a crack? | Gap. | 1 |
| 4. What is a fragment? | Small piece. | 1 |
| 5. Does it happen fast? | No. | 1 |
| 6. Why does ice break rock? | Expands. | 1 |
| 7. Why do roots break rock? | Push apart. | 1 |
| 8. Why makes soil? | Fragments. | 1 |
| 9. Model freezing. | Observations. | 1 |
| 10. List agents. | List. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Breaking rock.; 2 Ice.; 3 Gap.; 4 Small piece.; 5 No.. Level 2: 1 Expands.; 2 Push apart.; 3 Fragments.. Level 3: 1 Observations.; 2 List.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Define weathering | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Name types of weathering | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Explain how ice breaks rock | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Model weathering safely | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Rocks never break.” They weather.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain weathering.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns about weathering. You do not need to be an expert to help.
- Look for cracks outdoors.
- Ask “What caused it?”
- Do not climb walls.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: define weathering; name types of weathering; explain how ice breaks rock; model weathering safely.
Prerequisite knowledge. Grade 3 Earth ideas: types and uses of rocks, soils and how soil forms and moves.
Materials. Notebook, pencil. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Walk with adult.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Show a cracked stone and ask, “What broke it?”
Explanation (10 min). Teach weathering.
Guided activity (10 min). Learners model.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What agent? What fragment?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Rocks never break.” They weather.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain weathering. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 4 Unit 7, topic 4; Next Generation Science Standards, Earth’s systems; Cambridge Primary Science Stage 4, Earth and space: rocks and soils; IB Primary Years Programme, sharing the planet. These sources informed the lesson.