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Soil

From Biology-Online Dictionary | Biology-Online Dictionary
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soil

Unconsolidated material on the earth's surface that supports or is capable of supporting plants out-of-doors. Material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use); the land had never been plowed; good agricultural soil.The part of the earth's surface consisting of humus and disintegrated rock.The top layer of the Earth's crust that consists of sufficient minerals and organic material to be richly inhabited by organisms in general. Many factors in the composition of soil, such as its pH, will determine what sort of organisms will be most suited.