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Science lesson plan · 4th grade (Year 5 in England) · 45 minutes

Weathering, erosion or deposition?

Earth and rocks

CCSS NGSS.4-ESS2-1England: KS2 Y3 RocksEngland: KS3 Chemistry: Earth and atmosphere (rock cycle)

Objective and success criteria

Students will: Weathering, erosion or deposition?.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Weathering and erosion

Leads to: the next skill in this area.

Materials: Rock samples, Hand lenses, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 5 min

  • Quick retrieval from earlier learning (Weathering and erosion). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Which type of weathering is this: acid rain dissolving limestone? (physical weathering / chemical weathering / biological weathering) → chemical weatheringPrompt: Is it caused by temperature and ice, by a chemical reaction, or by living things?
  2. Which landform is mainly carved by a river over a very long time? (a volcano / an island / a canyon / a sand dune) → a canyonPrompt: The Grand Canyon was cut by the Colorado River.
  3. Which type of weathering is this: iron in rock rusting? (physical weathering / chemical weathering / biological weathering) → chemical weatheringPrompt: Is it caused by temperature and ice, by a chemical reaction, or by living things?

Hook · 5 min

  • Pass round different rocks and ask how each one might have formed.
  • Share the objective: Weathering, erosion or deposition?. Read the success criteria together.

I do: model it · 10 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: Which process is this: tree roots growing into a rock?
  • Step 1: Weathering breaks rock into smaller pieces where it is.
  • Step 2: So the answer is: weathering (rock breaks down in place)
  • Answer: weathering (rock breaks down in place)
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 10 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. Which process is this: waves dragging pebbles off a beach? (weathering (rock breaks down in place) / erosion (pieces are carried away) / deposition (pieces are dropped)) → erosion (pieces are carried away)Prompt: Breaking, moving or dropping?
  2. Three of these are examples of weathering. Which one is NOT? (tree roots growing into a rock / a boulder cracking after many hot days and cold nights / waves dragging pebbles off a beach / acid rain dissolving a limestone statue) → waves dragging pebbles off a beachPrompt: Is the rock being broken, carried, or dropped?

You do: independent practice · 10 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 5 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Which process is this: a river carrying sand downstream? (weathering (rock breaks down in place) / erosion (pieces are carried away) / deposition (pieces are dropped)) → erosion (pieces are carried away)Prompt: Breaking, moving or dropping?
  2. Lichen and moss growing on a gravestone slowly roughen its surface. Which process is this? (erosion / melting / weathering / deposition) → weatheringPrompt: Is the rock being carried away, or broken where it is?

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Weathering and erosion.
  • Use concrete materials: rock samples.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-4.

Free lesson plan from eurekami.com/lesson-plan-builder

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Weathering, erosion or deposition?

Name

Date

Score/ 8

  1. Question 1

    Three of these are examples of deposition. Which one is NOT?

    • A. sand piling up into a dune
    • B. water freezing in a crack and splitting a rock
    • C. a river dropping mud at its mouth to make a delta
    • D. pebbles settling at the bottom of a lake

  2. Question 2

    Why do roads get more potholes after a cold winter?

    • A. Snow eats the road.
    • B. Water seeps into cracks, freezes, expands and breaks the surface.
    • C. Cold makes the road melt.
    • D. Cars are heavier in winter.

  3. Question 3

    Which process is this: a river carrying sand downstream?

    • A. weathering (rock breaks down in place)
    • B. erosion (pieces are carried away)
    • C. deposition (pieces are dropped)

  4. Question 4

    Three of these are examples of weathering. Which one is NOT?

    • A. a boulder cracking after many hot days and cold nights
    • B. acid rain dissolving a limestone statue
    • C. tree roots growing into a rock
    • D. pebbles settling at the bottom of a lake

  5. Question 5

    Which process is this: wind blowing soil off a dry field?

    • A. weathering (rock breaks down in place)
    • B. erosion (pieces are carried away)
    • C. deposition (pieces are dropped)

  6. Question 6

    Which order shows how a beach can form from a cliff?

    • A. deposition → erosion → weathering
    • B. deposition → weathering → erosion
    • C. weathering → erosion → deposition
    • D. erosion → deposition → weathering

  7. Question 7

    A river is fast in the mountains and slow near the sea. Where will it drop most of its mud?

    • A. in the mountains, where it is fast
    • B. near the sea, where it slows down
    • C. in the clouds
    • D. it never drops mud

  8. Question 8

    Which process is this: pebbles settling at the bottom of a lake?

    • A. weathering (rock breaks down in place)
    • B. erosion (pieces are carried away)
    • C. deposition (pieces are dropped)

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Answer key: Weathering, erosion or deposition?

  1. 1. B. water freezing in a crack and splitting a rock

  2. 2. B. Water seeps into cracks, freezes, expands and breaks the surface.

  3. 3. B. erosion (pieces are carried away)

  4. 4. D. pebbles settling at the bottom of a lake

  5. 5. B. erosion (pieces are carried away)

  6. 6. C. weathering → erosion → deposition

  7. 7. B. near the sea, where it slows down

  8. 8. C. deposition (pieces are dropped)