what horizons A????
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The mineral soil usually starts with an A horizon. If a well-developed subsoil horizon as a result of soil formation exists
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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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