Weathering and Erosion

Active learning builds understanding of weathering and erosion by letting students see cause and effect in real time. When students manipulate materials and observe changes, they grasp how small forces accumulate to shape landscapes over long periods.

• Year 6
• Science
• 4 activities
• 20 min–50 min

Learning Objectives

1. Compare the physical and chemical weathering effects on granite and sandstone samples.
2. Explain the roles of water, wind, and ice in transporting weathered materials.
3. Predict the impact of human activities, such as deforestation or construction, on erosion rates.
4. Classify different landforms based on the primary erosional agent responsible for their formation.

Stations Rotation

⏱ 45 min·Small Groups

Stations Rotation: Weathering Processes

Prepare four stations: freeze-thaw (ice cubes in rock cracks), abrasion (sandpaper on rocks), chemical (vinegar on limestone/chalk), and root wedging (model with clay and toothpicks). Groups rotate every 10 minutes, sketch changes, and note differences by rock type. Conclude with a class share-out.

Prepare & details

Compare the effects of physical and chemical weathering on different rock types.

Facilitation Tip: During Station Rotation, give each group a timer card and a data sheet to record observations at each weathering station before moving on.

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

Stations Rotation

⏱ 30 min·Pairs

Pairs: Erosion Races

Provide trays with soil, rocks, and water sprayers for rivers, fans for wind, or ice cubes for glaciers. Pairs predict and time how far materials move under each agent, measure distances, and adjust variables like slope. Record results in a comparison table.

Prepare & details

Explain how water, wind, and ice contribute to the erosion of landscapes.

Facilitation Tip: Set a 3-minute warning bell for Erosion Races so pairs can finalize predictions and prepare to share results.

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

Stations Rotation

⏱ 50 min·Small Groups

Small Groups: Human Impact Models

Groups build layered landscapes with sand, clay, and vegetation (moss or grass seeds). Simulate human activities: remove plants for farming, add barriers for prevention. Pour water to observe erosion rates, photograph before/after, and predict long-term effects.

Prepare & details

Predict how human activities might accelerate or prevent natural erosion processes.

Facilitation Tip: Ask groups to assign roles in Human Impact Models to ensure all students contribute to building and explaining their erosion simulation.

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

Stations Rotation

⏱ 20 min·Whole Class

Whole Class: Rock Weathering Timeline

Display rock samples and student-tested pieces. As a class, sequence photos of changes over weeks, discuss rates for different rocks, and link to Australian examples like Uluru. Vote on most effective prevention method.

Prepare & details

Compare the effects of physical and chemical weathering on different rock types.

Facilitation Tip: Before the Rock Weathering Timeline, provide labeled photos of each rock type so students can match visual evidence to weathering processes during the activity.

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

Teaching This Topic

Teachers often move too quickly from explanation to abstraction when teaching weathering and erosion. Instead, use concrete models and repeated observations to build durable understanding. Avoid front-loading too many terms before students see the processes in action, as this can confuse rather than clarify. Research shows that students grasp abstract Earth science concepts best when they manipulate materials and discuss results in small groups before large-group explanations.

What to Expect

Students will describe the difference between weathering and erosion using evidence from experiments. They will explain how different agents cause changes and relate these processes to landform creation with accurate vocabulary.

Watch Out for These Misconceptions

Common Misconception

During Station Rotation: Weathering Processes, watch for students who describe weathering and erosion as happening simultaneously in the same step.

What to Teach Instead

Pause the station rotation after two minutes and ask each group to identify which part of the process they observed: breaking down in place or moving materials. Have them write 'Weathering' on one side of their data sheet and 'Erosion' on the other, then sort their observations accordingly before moving to the next station.

Common Misconception

During Erosion Races, watch for students who assume water is the only agent that causes erosion.

What to Teach Instead

Provide a wind tube and ice cube tray alongside water containers for races, and ask teams to predict how each agent will move materials differently. After races, have teams present their measurements and compare how each agent transported sediment.

Common Misconception

During Rock Weathering Timeline, watch for students who believe rocks remain unchanged after formation.

What to Teach Instead

Hand out magnifiers and set up a photo station where students observe a limestone sample before and after a 10-minute vinegar soak. Ask them to sketch changes and post their before-and-after images on a class timeline to show gradual transformation.

Assessment Ideas

Quick Check

After Station Rotation, present students with three images of rock surfaces (one pitted by freeze-thaw, one rusted by oxidation, one smooth river stone). Ask them to write whether each shows physical or chemical weathering and provide one piece of evidence from the station work.

Discussion Prompt

After Human Impact Models, pose the scenario of forest clearing for development. Ask groups to use their model results to explain in two sentences how clearing might increase erosion by wind or water, citing specific agents from their simulations.

Exit Ticket

During Rock Weathering Timeline, give each student a landform card (e.g., canyon, dune, fjord). Ask them to name the primary erosion agent and write one human activity that could slow further erosion of that landform.

Extensions & Scaffolding

• Challenge a second set of students to design an erosion control method for a slope in a model landscape, using household materials to test effectiveness.
• Scaffolding: Provide sentence stems for pairs during Erosion Races, such as 'We predict ______ will erode faster because ______.'
• Deeper exploration: Have students research a famous landform (e.g., Uluru, the Grand Canyon) and trace its formation back to specific weathering and erosion agents over time.

Key Vocabulary

Weathering	The breakdown and alteration of rocks and minerals at or near the Earth's surface.
Physical Weathering	The mechanical disintegration of rocks into smaller pieces without changing their chemical composition. Examples include abrasion and freeze-thaw action.
Chemical Weathering	The decomposition of rocks through chemical reactions, altering their mineral composition. Examples include dissolution and oxidation.
Erosion	The process by which earth materials are transported from one place to another by natural agents like water, wind, or ice.
Deposition	The geological process in which sediments, soil, and rocks are added to a landform or landmass, often after being transported by erosion.