Define horizon and humus
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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 technical definition of an A horizon may vary between the systems, but it is most commonly described in terms relative to deeper layers.
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The A horizon is the top layer of the mineral soil horizon often referred to as 'top soil' . This layer contains dark decomposed organic matter which is called 'humus' . The technical definition on an Ap horizon may vary between the systems , but it is most commonly described in terms relative to deeper layers.
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