A dry erosion model represents one part of a larger process

Gently tilting paper pieces on a tray can show downhill movement. Keep the analogy limited: paper pieces do not share every property of soil, and the tabletop activity does not recreate all erosion mechanisms.

To hand: Paper pieces and a shallow tray.

Set a low slope. Tilt gently. Record movement.

Describe the movement the model shows

Describe the material movement without equating paper pieces with every property of soil. The model illustrates a selected aspect of a wider process.

The model shows pieces moving downhill but does not reproduce every soil process.

Avoid loose dust and airborne materials. Which process is only represented?

Watch a demonstration.

Present the tray as an analogy

Place a few large lightweight paper pieces on a shallow tray with raised edges. The educator gently changes the tray from level to a low slope while observers watch from a comfortable position. Keep the pieces large enough not to become airborne and do not add dust, sand sprays or powerful airflow. The activity needs only a visible change in position.

Record which pieces move, where they start and where they stop. A simple before-and-after outline can show the movement clearly. Ask whether pieces slide together, catch at an edge or remain still. These observations describe the paper and tray, so preserve that language before introducing any landscape comparison.

Name the represented process carefully

The model can illustrate the idea that material moves downhill under gravity. It does not reproduce every feature of erosion or sediment transport. Real soil and rock have properties unlike paper, and moving water, wind, ice and other conditions can matter in real landscapes. A tilted tray is a selected representation, not a miniature copy of all those mechanisms.

Distinguish wearing away or removal, transport and deposition when using those terms. A piece ending at the tray's lower edge can represent material coming to rest, but it has not become actual sediment merely because it stands for sediment in a diagram. Label the analogy so the class knows which aspects are intended to correspond.

If comparing two low slopes, use the same tray and paper arrangement as closely as practical. Record differences in starting placement that may affect movement. A piece caught under another introduces a feature of this setup; it should not be transformed into a universal rule about soil stability. Ask what further evidence would be needed to discuss a real hillside.

Offer a side-view sketch, enlarged sequence photographs or a partner's spoken description. Children can place arrows on a diagram rather than tilt the tray. End by naming one thing the model shows well and one thing it cannot establish. This allows a safe, concrete demonstration while building the habit of stating limits whenever a classroom material represents a wider natural process.

Resources

Reflection Journal Template — Use the editable recording prompts for a short evidence-and-question record, alongside the checked topic source.

A dry erosion model represents one part of a larger process

Describe the movement the model shows

Present the tray as an analogy

Name the represented process carefully

Resources

Further reading

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