Subsoil
Encyclopedia : S : SU : SUB : Subsoil
Subsoil is the layer of soil under the topsoil on the surface of the ground. The subsoil may include substances such as clay and has only been partially broken down by air, sunlight, water, etc., to produce true soil. Below the subsoil is the substratum, which can be residual bedrock, sediments, or aeolian deposits, largely unaffected by soil forming factors active in the subsoil.
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