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Erosion Moves Earth Materials

Grade 4 Earth Science — Shaping Earth’s Surface | Unit 1, Lesson 2 of 6

📚 Grade: 4th Grade⏱️ Duration: 45–60 minutes🔬 Subject: Earth Science — Shaping Earth’s Surface

🌧️⛰️➡️

Water, wind, ice, and gravity can move weathered Earth materials from one place to another.

📋 NGSS Standard:
4-ESS2-1 — Make observations and/or measurements to provide evidence of the effects of weathering or the rate of erosion by water, ice, wind, or vegetation. / 4-ESS2-2 — Analyze and interpret data from maps to describe patterns of Earth’s features.

🎯 Learning Objective

Students will compare weathering and erosion and explain how erosion moves sediment across Earth’s surface.

💡 The Big Idea

Erosion is the movement of weathered material. Water, wind, ice, and gravity can all carry sediment from place to place.

🔬 The Science

Science Snapshot

Erosion is a transport process, so direction and movement matter.

What is happening?

Erosion is the movement of earth materials from one place to another. Water, wind, ice, and gravity can all be erosion agents if they carry sediment away from where it started.

Why it works that way

The strength of the moving force and the size of the particles both matter. Fast water can carry larger pieces than slow water, and wind usually moves the finest materials most easily.

Look for this in the lesson

Students should describe both the material and the mover. That makes their explanation more precise than simply saying the land “changed.”

Ask while you read: What evidence tells you that material was moved rather than only broken apart?

📦 Materials

🏠 Household Items to Gather

Tray or baking pan
Soil, sand, or crumbs
Cup of water or spray bottle
Worksheet and pencil

📋 Printables

Student worksheet page from this lesson

🧪 Investigation

Step 1 — Review weathering vs erosion (8 min)
Compare breaking rock with moving rock and sort example cards into the two groups.

Step 2 — Make a sloped surface (10 min)
Tilt a tray with soil or crumbs and predict what water will do.

Step 3 — Add water and observe movement (10 min)
Watch how material moves downhill and where it collects.

Step 4 — Explain the evidence (10 min)
Students identify what moved, what caused the movement, and where the material went.

Step 5 — Compare different erosion agents (10 min)
Discuss how wind, water, ice, and gravity can each move Earth materials in different ways.

💬 Discussion Questions

What makes erosion different from weathering?Erosion moves the material; weathering breaks or changes it.

What evidence shows erosion happened in your model?Students may mention sediment moved downhill or collected in a new place.

Why does slope matter?Gravity helps pull water and loose material downhill.

Can erosion happen slowly?Yes. Even small repeated movement over time changes landforms.

🚀 Extensions

Extension: Watch water after rain and look for tiny places where soil or sand has moved.

👩‍🏫 Parent/Teacher Notes

Teaching move: Ask students to point to the material before and after movement so their explanation stays evidence-based.

Misconception to catch: Students may say erosion means any change at all. Push them to include movement from one place to another.

Student Worksheet

Name: ________________________ Date: ________________________

Track where sediment moved

Record what happened before, during, and after erosion in your model.

Before water moved	After water moved	Evidence of erosion

2️⃣ Which process is it?

Circle the best match and explain why: weathering / erosion

🔑 PARENT ANSWER KEY — Detach before giving worksheet to students

Sample ideas

If sediment moved downhill and collected in a different place, erosion happened. If the material only broke apart, that is weathering.

✅ What Success Looks Like

Student distinguishes movement from breaking.
Student identifies water, wind, ice, or gravity as an erosion agent.
Student uses observations from the model as evidence.