What is meant by soil? State the method adopted to prevent soil erosion.

The thin topmost layer of the earth's crust, made up of fine rock particles and organic matter is termed as soil. It is a layer of unconsolidated materials at the earth's surface.

Some methods to prevent soil erosion are:

1. Afforestation
2. To check overgrazing
3. Constructing dams and barrages
4. Improve techniques of agriculture