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Soil | Definition, Importance, Types, Erosion, Composition, Facts . . . Soil, the biologically active, porous medium that has developed in the uppermost layer of Earth’s crust It is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the filtration and breakdown of wastes, and as a participant in the cycling of elements
What is Soil? - Natural Resources Conservation Service soil - Soil is a natural body comprised of solids (minerals and organic matter), liquid, and gases that occurs on the land surface, occupies space, and is characterized by one or both of the following: horizons, or layers, that are distinguishable from the initial material as a result of additions, losses, transfers, and transformations of