Classification of Soils in India: Important Facts Soil is the uppermost layer of the earth’s crust capable of supporting life. Soil is the most important renewable natural resource. The major factors affecting the formation of soil are relief, parent material, climate, vegetation, and other life-forms and time. Besides these, human activities also influence it to a large extent. Layers of Soil: The three layers of soil are: A-Horizon: The uppermost layer of the soil is called topsoil or A-horizon. It is the darkest of all layers. The dark color is due to the presence of humus which makes the soil … Continue reading Classification of Soils in India