Topsoil : subsoil : : A-Horizon:.............
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The A horizon is the top layer of the mineral soil horizons, often referred to as 'topsoil'. This layer contains dark decomposed organic matter, which is called "humus". ... The A is a surface horizon, and as such is also known as the zone in which most biological activity occurs
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Topsoil : Subsoil : : A Horizon : B horizon
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