Weathering and Erosion

Active learning works well for weathering and erosion because the processes happen slowly in nature, but students need to see changes happen in real time to grasp the concepts. Hands-on stations and models let students observe physical, chemical, and biological weathering up close, while erosion activities show how materials move, making abstract ideas concrete and memorable.

• Secondary 1
• Science
• 4 activities
• 30 min–50 min

Learning Objectives

1. Compare the physical and chemical changes that occur during different types of weathering.
2. Analyze the role of agents like water, wind, and gravity in transporting weathered materials.
3. Explain how deforestation and urbanization can accelerate soil erosion.
4. Evaluate the effectiveness of mitigation strategies such as terracing and contour plowing in reducing erosion.
5. Predict the impact of specific weathering agents on different rock types, such as granite and limestone.

Stations Rotation

⏱ 45 min·Small Groups

Stations Rotation: Types of Weathering

Prepare four stations: physical (ice cubes in rock cracks), chemical (vinegar on chalk), biological (crackers with toothpicks as roots), and control. Groups rotate every 10 minutes, sketch changes, and note conditions. Conclude with class share-out on patterns.

Prepare & details

Compare the processes of weathering and erosion and their effects on landscapes.

Facilitation Tip: During the Types of Weathering station rotation, circulate with a clipboard and check that students record evidence for each type, not just definitions, to prevent passive copying.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Simulation Game

⏱ 30 min·Pairs

Pairs: Rock Abrasion Shake Test

Pairs fill jars with water, pebbles, and rock fragments of different hardness, then shake vigorously for set intervals. Measure mass loss and compare results. Discuss how this models river erosion.

Prepare & details

Explain how human activities can accelerate or mitigate erosion.

Facilitation Tip: For the Rock Abrasion Shake Test, assign roles clearly so one student shakes while another times and another measures mass to keep all students engaged in data collection.

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

Simulation Game

⏱ 50 min·Small Groups

Small Groups: Erosion Landscape Model

Groups build layered landscapes with sand, clay, and gravel in trays, then simulate rain with watering cans at varying angles. Observe sediment transport and deposition. Predict and test slope effects.

Prepare & details

Predict the long-term impact of specific weathering agents on different rock types.

Facilitation Tip: When building the Erosion Landscape Model, ask groups to predict what will happen before adding water or wind to encourage hypothesis testing and observation skills.

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

Simulation Game

⏱ 35 min·Whole Class

Whole Class: Human Impact Debate

Project images of eroded farms versus vegetated slopes. Class votes on solutions like planting trees, then researches one mitigation strategy and presents evidence in 2 minutes.

Prepare & details

Compare the processes of weathering and erosion and their effects 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

Teaching This Topic

Teachers often introduce weathering first in isolation so students can isolate variables, then layer on erosion to show how materials move. Avoid rushing to human impacts too soon; let students experience natural processes first. Research shows that hands-on comparisons between physical, chemical, and biological weathering build deeper understanding than lectures alone.

What to Expect

Successful learning looks like students confidently distinguishing weathering from erosion, naming specific agents for each, and explaining how human choices affect these processes. They should use evidence from activities to support their claims, such as data from abrasion tests or observations from erosion models.

Watch Out for These Misconceptions

Common Misconception

During Types of Weathering station rotation, watch for students who say weathering and erosion are the same process. Redirect them by asking, 'Does the rock move in any station? If not, it’s weathering; if it does, that’s erosion.'

What to Teach Instead

After the station rotation, ask pairs to create a Venn diagram comparing weathering and erosion using station examples as evidence, then share one difference aloud.

Common Misconception

During the Rock Abrasion Shake Test, watch for students who assume water is the only erosion agent. Redirect by asking, 'What if we tried shaking without water? Would the mass still change?'

What to Teach Instead

After the Shake Test, have students write a short paragraph explaining why wind or gravity could also cause abrasion in nature, using their data as support.

Common Misconception

During the Human Impact Debate, watch for students who say rocks never change noticeably. Redirect by asking, 'How did the mass change in your Shake Test? Could that happen in nature over 100 years?'

What to Teach Instead

After the debate, ask students to calculate how much mass might be lost from a rock over 100 years using their Shake Test data scaled up, to build appreciation for slow changes.

Assessment Ideas

Quick Check

After Types of Weathering station rotation, display images of landscapes and ask students to identify the dominant weathering or erosion agent for each, using evidence from their station notes to justify their choices.

Discussion Prompt

During the Human Impact Debate, listen for students to name two specific erosion problems (e.g., soil runoff, landslides) and two prevention measures (e.g., retaining walls, planting vegetation) for the hilly housing development scenario.

Exit Ticket

After the Erosion Landscape Model, ask students to define weathering and erosion in their own words and provide one example of how human activity has impacted either process, using observations from their model to support their answer.

Extensions & Scaffolding

• Challenge early finishers to design a landscape that shows all four erosion agents (water, wind, ice, gravity) and label how each shapes the land.
• Scaffolding: Provide sentence starters for students to use during the Human Impact Debate, such as, 'One problem is... A solution could be...'
• Deeper exploration: Have students research how climate change might alter weathering rates and present findings to the class.

Key Vocabulary

Weathering	The process of breaking down rocks, soil, and minerals through direct contact with the atmosphere, water, and biological organisms. It does not involve movement.
Erosion	The process by which earth materials are worn away and transported by natural forces such as wind, water, or ice.
Physical Weathering	The breakdown of rocks into smaller pieces without changing their chemical composition. Examples include frost wedging and abrasion.
Chemical Weathering	The breakdown of rocks through chemical reactions, such as oxidation or the action of acids. This changes the mineral composition of the rock.
Deposition	The geological process in which sediments, soil, and rocks are added to a landform or landmass. It occurs when the forces moving the material (wind, water, ice) lose energy.