For A Horizon we have terms and definitions in 2 topics. The topics are Geologic and Physical Geography.

A Horizon (Geologic)

The 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'.

A Horizon (Physical Geography)

Soil 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 with mineral particles.
(2) A zone of translocation from which eluviation has removed finer particles and soluble substances.

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