Soil, Its four Layers, and the Process of Its Formation
Soil is const...
Soil is constantly formed by weathering of rocks. Why then are we so concerned about soil erosion?
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Topsoil is the most fertile soil because it consists of humus. Soil erosion removes topsoil, thus decreasing soil fertility. The formation of topsoil by the process of weathering takes a very long time. Hence, we are so concerned about soil erosion.