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A HorizonSoil horizon normally found below the O horizon and above the B horizon. This layer is characterized by the following two features: (1) A layer in which humus and other organic materials are mixed wit [..]
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A HorizonSee: horizon; soil
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A HorizonThe top layer of soil. Plant and other organic debris builds up in this layer. This is the part of the soil generally referred to as 'top soil'.
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