1. Wind breaks are a few rows of trees and shrubs planted on border of the crop fields at right angles to the direction of wind. This technique remains effective in checking of soil erosion by the wind.

    Wind breaks are a few rows of trees and shrubs planted on border of the crop fields at right angles to the direction of wind. This technique remains effective in checking of soil erosion by the wind.

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  2. Top soil is the upper fertile biologically active layer of soil which is rich in minerals, organic matter, microorganisms (bacteria, fungi, earthworms and other animals). Roots of plants are mostly restricted to top soil.

    Top soil is the upper fertile biologically active layer of soil which is rich in minerals, organic matter, microorganisms (bacteria, fungi, earthworms and other animals). Roots of plants are mostly restricted to top soil.

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  3. Humification is addition of partially decomposed organic matter or humus into weathered rock particles to form soil.

    Humification is addition of partially decomposed organic matter or humus into weathered rock particles to form soil.

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  4. There are three types of weathering of rocks: physical, chemical and biological.

    There are three types of weathering of rocks: physical, chemical and biological.

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  5. Contamination of soil with solid wastes, chemicals and excess of fertilizers and pesticides thus reducing its fertility and quality, is called soil pollution.

    Contamination of soil with solid wastes, chemicals and excess of fertilizers and pesticides thus reducing its fertility and quality, is called soil pollution.

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