Fill in the blanks 1. The layer of Earth is rich in humus.
2. Tree and other plants firmly bind the particles.
3. In the absence of trees and plants, soil becomes .
4. Percolation rate of water in soil is expressed in the unit of .
5. Excessive use of insecticides and pesticides can cause . 6. Deforestation the particles in the soil and leads to soil erosion.
7. soil is used in construction of buildings.
8. Cotton is grown in soil.
9. Ground water is formed in layer of earth.
10. Humus is formed by of organic matter.

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