soil erosion

  

Definition

Removal of topsoil faster than the soil forming processes can replace it, due to natural, animal, and human activity (over grazing, over cultivation, forest clearing, mechanized farming, etc.). Soil erosion results in land infertility and leads to desertification and devastating flooding. It is estimated that 20 percent of the world's topsoil was lost during 1950-1990, and its loss is continuing at a faster rate.

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