Science · 6th Grade

Active learning ideas

Erosion and Deposition

Active learning builds durable understanding of erosion and deposition because students observe how small, continuous processes accumulate over time to reshape landforms. Hands-on models and collaborative tasks make abstract energy gradients and particle-size sorting visible in minutes rather than years.

• Common Core State Standards
• MS-ESS2-1
• MS-ESS2-2

• 20–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Inquiry Circle
• 50 min · Small Groups

Inquiry Circle: Stream Table Experiment

Groups use stream tables or plastic bins with sand and a water source to model erosion and deposition. They systematically vary slope angle and water flow rate, recording how each change affects the rate of erosion and the location where sediment is deposited. Groups present their findings as a cause-and-effect explanation.

Explain how glaciers reshape landscapes over long periods.

Facilitation Tip

During the Stream Table Experiment, circulate with a stopwatch and call out elapsed time so students connect flow speed directly to erosion and deposition events.

What to look for

Provide students with images of three different landforms (e.g., a delta, a sand dune, a U-shaped valley). Ask them to identify the primary agent of erosion/deposition for each and write one sentence explaining how that landform was created.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: How Did That Canyon Form?

Show a cross-section diagram of the Grand Canyon layers alongside a present-day photograph. Partners discuss the agents of erosion and deposition involved, the time required to produce each layer, and what the area might have looked like before carving began.

Analyze how the rate of erosion changes based on the type of soil or rock.

Facilitation Tip

For the Think-Pair-Share on canyon formation, provide labeled cross-sections so pairs trace the path of water and sediment step-by-step.

What to look for

Present students with a scenario: 'A fast-moving river carries a heavy load of sediment and then enters a wide, slow-moving lake.' Ask them to list, in order, the types of sediment (e.g., boulders, sand, silt, clay) that would be deposited as the river slows down and explain why.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 03

• Gallery Walk
• 25 min · Small Groups

Gallery Walk: Erosion Agents

Post photographs of landforms produced by each major erosion agent: river, glacier, wind, ocean waves, and mass movement (landslide). Students identify the agent responsible, the resulting landform type, and one US location where this process is actively occurring.

Differentiate between erosion and deposition and their resulting landforms.

Facilitation Tip

During the Gallery Walk, place a small mirror at each station so students view landform shapes from multiple angles before recording observations.

What to look for

Pose the question: 'How might a landslide (mass wasting) change the landscape of a mountain region, and what happens to the deposited material afterward?' Facilitate a class discussion, guiding students to connect gravity's role in erosion with the subsequent deposition of debris.

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Activity 04

• Experiential Learning
• 30 min · Small Groups

Sorting Activity: Grain Size and Deposition Order

Groups receive mixed samples of gravel, sand, silt, and clay. They predict and then test the deposition order by adding the mixed sample to a water column in a clear tube and timing when each size class settles. Groups connect their results to real-world river delta and floodplain formation.

Explain how glaciers reshape landscapes over long periods.

Facilitation Tip

In the Sorting Activity, have students physically stack sediment cards from largest to smallest to reinforce deposition order rules.

What to look for

Provide students with images of three different landforms (e.g., a delta, a sand dune, a U-shaped valley). Ask them to identify the primary agent of erosion/deposition for each and write one sentence explaining how that landform was created.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Start with the stream table to anchor the concept in observable time scales, then contrast river and glacial erosion using the gallery walk to highlight valley shapes and grain textures. Avoid over-reliance on diagrams alone; the physical model makes energy gradients concrete. Research shows students grasp deposition order best when they sort real sediment samples before abstracting the pattern.

Successful learning looks like students explaining how energy loss causes deposition in specific layers, predicting the sequence of sediment settling, and distinguishing between agents by observing landform shapes and grain sizes.

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Watch Out for These Misconceptions

• During the Stream Table Experiment, watch for students assuming erosion only happens during sudden, large changes in water volume.

  Pause the flow every 30 seconds and point out tiny ripples and particle movements; ask students to estimate how much material moves in one minute and multiply by the total run time to reveal continuous change.

• During the Gallery Walk, listen for students describing glaciers and rivers as using the same erosion method.

  Place a U-shaped valley image next to a V-shaped valley image and ask students to trace the pattern of scraping versus downcutting using their fingers on the printed shapes.

• During the Sorting Activity, watch for students believing deposition requires agents to stop completely.

  Have students sort sediment cards while holding them at different heights above the table: higher drops simulate losing energy early, lower drops represent energy loss later, showing deposition begins with reduced speed, not full stop.

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Methods used in this brief

• Inquiry Circle
• Think-Pair-Share
• Gallery Walk
• Experiential Learning