Weathering and Erosion

Active learning transforms abstract geological processes into tangible experiences. When students manipulate models or observe real effects, they build durable mental connections between cause and effect. For weathering and erosion, hands-on activities like freeze-thaw or stream tables make slow processes visible, helping students connect classroom science to Irish landscapes such as the Burren or River Shannon.

• 6th Class
• Scientific Inquiry and the Natural World
• 4 activities
• 30 min–45 min

Learning Objectives

1. Compare and contrast the processes of weathering and erosion using specific examples of Irish landscapes.
2. Explain the role of water, wind, and ice as agents of both weathering and erosion, citing evidence from observations or models.
3. Analyze how weathering and erosion have shaped a chosen Irish landform, such as the Giant's Causeway or the Cliffs of Moher.
4. Design a simple model to demonstrate either physical weathering or a specific type of erosion.

Case Study Analysis

⏱ 40 min·Small Groups

Demonstration: Freeze-Thaw Weathering

Provide clay or soft rock in plastic containers with water. Freeze overnight, then thaw and measure crack expansion. Students rotate to observe multiple samples, sketch changes, and discuss physical expansion as the cause. Compare to dry samples.

Prepare & details

Differentiate between weathering and erosion.

Facilitation Tip: On the schoolyard erosion walk, give each student a colored flag to mark evidence of weathering or erosion, ensuring all students actively scan the environment.

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

⏱ 45 min·Pairs

Experiment: Stream Table Erosion

Build stream tables with sand, soil, and rocks. Pour water at varying speeds to simulate rivers, observing sediment movement and valley formation. Measure channel depth before and after, then adjust slope for comparisons.

Prepare & details

Explain how water, wind, and ice contribute to weathering and 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

Simulation Game

⏱ 30 min·Small Groups

Simulation Game: Wind Abrasion

Use hair dryers to blow sand across trays of soft chalk or clay. Students mark starting shapes, run trials with different wind speeds, and measure abrasion rates. Photograph results for class timeline.

Prepare & details

Analyze the impact of weathering and erosion on landscapes.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Case Study Analysis

⏱ 35 min·Whole Class

Field Investigation: Schoolyard Erosion

Walk school grounds to find erosion evidence like gullies or exposed roots. Students sketch sites, hypothesize causes, and propose prevention like mulch barriers. Share findings in whole-class map.

Prepare & details

Differentiate between weathering and 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 emphasize the sequence of weathering followed by erosion, as students often conflate the two. Use analogies such as breaking a cookie in place (weathering) versus crumbs being blown off the plate (erosion). Research shows that students grasp slow processes better when they manipulate models and witness incremental changes over short timeframes.

What to Expect

Students will confidently distinguish weathering from erosion and identify agents like water, wind, and ice in local features. They will use evidence from experiments and field observations to explain how these processes shape landforms over time. Success includes accurate labeling, clear verbal explanations, and thoughtful predictions based on observed patterns.

Watch Out for These Misconceptions

Common Misconception

During the freeze-thaw demonstration, watch for students using the terms weathering and erosion interchangeably while observing ice expanding in rock cracks.

What to Teach Instead

Pause the activity to ask groups to label each step: cracking the rock is weathering, while moving the pieces is erosion. Have them physically separate the stages by removing fragments from their model before reshaping it.

Common Misconception

During the stream table erosion, watch for students assuming water alone causes all erosion, ignoring wind or ice effects.

What to Teach Instead

After the activity, ask students to compare their stream table results with images of wind-formed dunes or glacier-carved valleys. Challenge them to explain why their model only shows water erosion and how other agents would alter the landscape.

Common Misconception

During the schoolyard erosion field investigation, watch for students concluding that weathering and erosion happen quickly, such as during a single rain event.

What to Teach Instead

End the walk by having students sketch the same spot on two sheets: one showing immediate changes and one showing how the site might look in 100 years. Use these sketches to discuss timescales and cumulative effects.

Assessment Ideas

Quick Check

After the stream table erosion, present students with images of different Irish landscapes and ask them to identify one dominant weathering process and one dominant erosion process visible in each, explaining their reasoning in two sentences.

Exit Ticket

During the freeze-thaw demonstration, have students write one sentence defining weathering and one sentence defining erosion on a card. Then, ask them to list one agent (water, wind, or ice) that causes both processes and provide a one-sentence example of its action from the activity.

Discussion Prompt

After the schoolyard erosion field investigation, pose the question: 'If a rock is broken into tiny pieces by weathering but those pieces stay in place, has erosion occurred?' Facilitate a class discussion, guiding students to articulate the difference between the two processes using evidence from their field notes.

Extensions & Scaffolding

• Challenge students to design a miniature landscape in a tray that demonstrates two different erosion agents, then present their model to the class with explanations.
• For students who struggle, provide pre-labeled diagrams of weathering and erosion stages to annotate during activities, helping them connect vocabulary to observations.
• Deeper exploration: Have students research how human activities like quarrying or deforestation accelerate weathering or erosion, then design a public awareness poster for their local area.

Key Vocabulary

Weathering	The process that breaks down rocks and minerals on the Earth's surface into smaller pieces. It occurs in place, without movement of the broken material.
Erosion	The process by which weathered rock and soil particles are moved from one place to another. This movement is caused by agents like water, wind, or ice.
Physical Weathering	The breakdown of rocks into smaller pieces without changing their chemical composition. Examples include freeze-thaw action and abrasion.
Chemical Weathering	The breakdown of rocks through chemical reactions, such as the reaction of rainwater with minerals. This changes the chemical composition of the rock.
Sediment	Small particles of rock, soil, and other materials that have been moved by wind, water, or ice. These particles can be deposited to form new landforms.