|Biology Demonstration Manual (Peace Corps, 1993, 35 p.)|
Lesson: Les plantes et l'homme: Leur importance dans le monde vivant
Rationale: Show that leaves as ground cover can protect the soil from erosion.
sand and leaves
watering can (or can with holes punched in it)
dissecting tray (science kit)
large dish pan
1. Put dissecting tray upside down in the bottom of the large
2. Put a layer of sand on top of the dissecting tray.
3. Lay a few leaves on top of the sand.
4. Let it rain. The sand will be washed off except for that under the leaves.
Source: HBJ Concepts in Science Orange, p. 175.