“Rocks are broken-down when sand rubs against them”. Write an experiment to prove it.
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- In this experiment, students think about how rocks change through time. They consider the breakdown of rock into smaller and smaller pieces through processes that collectively are known as weathering. The specific process that students examine in this investigation is abrasion, the action of rocks and sediment grinding against each other and wearing away exposed surfaces. In nature, abrasion occurs as wind and water rush over rocks, causing them to bump against one another and changing their shapes. Rocks become smoother as rough and jagged edges break off.
Materials Needed
- 2-3 sugar cubes
- 2-3 pieces of gravel
- small plastic container with a lid
- observation sheet
- magnifying glass
- paper
Safety
- This investigation is generally considered safe to do with students. Do not provide glass containers to students because the shaking of the gravel could cause them to break. Students should be reminded not to eat the sugar cubes. Also, review the investigation for your specific setting, materials, students, and conventional safety precautions.
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