Erosion and Deposition

Students grasp erosion and deposition best when they see these forces in action. Active simulations let them observe how wind, water, and ice reshape land in minutes, not millennia. By handling materials and adjusting variables, they build durable understandings that static images or lectures cannot provide.

• 5th Class
• Scientific Inquiry and the Natural World
• 4 activities
• 30 min–50 min

Learning Objectives

1. Explain how wind, water, and ice act as agents of erosion, transporting weathered materials.
2. Analyze the relationship between erosion and deposition, identifying landforms created by each process.
3. Predict the impact of specific human activities, such as deforestation or construction, on local erosion rates.
4. Compare the effectiveness of different methods, like planting vegetation or building retaining walls, in mitigating erosion.
5. Classify landforms based on whether they are primarily a result of erosion or deposition.

Case Study Analysis

⏱ 45 min·Small Groups

Stream Table Simulation: River Erosion

Provide trays with sand, soil, and rocks. Pour water from a height to simulate rivers, observing how it erodes banks and deposits sediment downstream. Students measure changes in landscape before and after, sketching results. Discuss velocity's role in transport.

Prepare & details

Explain how wind, water, and ice contribute to erosion.

Facilitation Tip: During the Stream Table Simulation, circulate and ask each group to predict where the fastest erosion will occur before they turn on the water.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Case Study Analysis

⏱ 35 min·Pairs

Wind Erosion Stations: Dune Formation

Set up fans blowing over trays of dry sand with barriers. Groups add pebbles or moisten sand, then record how wind moves particles and forms dunes. Rotate stations and compare deposition patterns. Clean up and share findings.

Prepare & details

Analyze the relationship between erosion and deposition in shaping landscapes.

Facilitation Tip: At the Wind Erosion Stations, set a timer so students rotate every three minutes; this keeps the focus on the effect of wind speed on sand movement.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Case Study Analysis

⏱ 50 min·Small Groups

Glacier Model: Ice Erosion

Freeze sand-water mixtures into ice blocks. Place on sloped wax paper trays; let melt under weight to mimic glaciers. Students track scratches and debris trails, measuring deposition piles. Predict outcomes with different loads.

Prepare & details

Predict the long-term effects of human activities on erosion rates.

Facilitation Tip: When running the Glacier Model, have students mark the initial position of the ice block so they can measure how far it scrapes the tray during melting.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Case Study Analysis

⏱ 30 min·Whole Class

Whole Class Debate: Human Impacts

Show images of Irish eroded farmlands. Students vote on solutions like terracing, then debate in teams using evidence from prior activities. Vote again and summarize consensus.

Prepare & details

Explain how wind, water, and ice contribute to erosion.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Teaching This Topic

Teachers should let students struggle slightly when making predictions before giving hints. Research shows this builds stronger conceptual models than immediate corrective feedback. Avoid telling them the answers; instead, pose questions like, 'Where do you think the heaviest sand grains will land?' Use hand lenses to let students examine the texture of deposited materials, reinforcing connections between particle size and transport.

What to Expect

By the end of these activities, students should accurately explain how different agents transport and deposit sediments. They will justify their claims with evidence from stream tables, wind stations, and glacier models. Clear oral and written explanations show they can connect processes to landforms and human impacts.

Watch Out for These Misconceptions

Common Misconception

During the Stream Table Simulation, watch for students who assume water is the only agent of erosion. Redirect them by asking, 'How might this river behave differently if wind or ice were acting here?'

What to Teach Instead

After the Stream Table Simulation, ask groups to compare their river’s behavior with the wind and glacier stations. Use a Venn diagram on the board to highlight which landforms each agent creates, forcing them to articulate differences.

Common Misconception

During the Wind Erosion Stations, watch for students who believe deposition only happens far from erosion sites. Redirect them by asking, 'Why did some sand settle right at the edge of your dune?'

What to Teach Instead

After the Wind Erosion Stations, have students measure the distance from the fan where the first grains settled. This quantitative data helps them see that deposition occurs immediately after transport ends.

Common Misconception

During the Glacier Model activity, watch for students who think changes happen too slowly to matter. Redirect them by asking, 'What minor changes did you observe in just ten minutes?'

What to Teach Instead

After the Glacier Model activity, ask students to create a timeline showing the short-term changes they observed (scratches, displaced soil) and compare it to images of real moraines formed over centuries.

Assessment Ideas

Exit Ticket

After the Stream Table Simulation and Glacier Model, provide images of a canyon, a sand dune, a river delta, and a moraine. Ask students to write the name of each landform, identify whether it is created by erosion or deposition, and name the agent involved.

Discussion Prompt

After the whole class debate on human impacts, pose the question: 'Imagine a new housing development is planned for a hillside area near a river.' Ask students to write down two potential erosion problems and two specific actions developers could take to reduce these problems before discussing as a class.

Quick Check

During the Stream Table Simulation, ask students to observe and record: 'What happens to the soil when the water flows over it?' and 'Where does the soil end up?' Collect their notes to check their understanding of movement and settling.

Extensions & Scaffolding

• Challenge students to design a miniature landscape in the stream table that creates a delta in under five minutes. They must sketch their plan first and explain their reasoning to a peer before testing.
• For students struggling with the glacier model, provide a secondary tray with smaller ice cubes to slow the process and allow closer observation of scraping.
• Deeper exploration: Students research and present how a local landform, such as a beach or valley, was shaped by erosion or deposition, citing evidence from maps, photos, or site visits.

Key Vocabulary

Erosion	The process by which natural forces like wind, water, and ice wear away and move rock and soil from one place to another.
Deposition	The process where eroded materials, such as sand, silt, and pebbles, are dropped or settled in a new location, building up landforms.
Sediment	Small particles of rock and soil that are carried by wind, water, or ice and eventually settle to form new land.
Weathering	The breakdown of rocks, soil, and minerals through contact with the Earth's atmosphere, water, and biological organisms.
Moraine	A mound or ridge of unsorted rock and sediment deposited by a glacier as it moves or melts.