- Ahorizon
-
A horizon
n.
In ABC soil, the uppermost zone of soil, containing humus; topsoil. Also called zone of leaching.
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Universalium. 2010.
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Universalium. 2010.
B-horizon — Illuvial horizon in which soluble material from the overlying Ahorizon has been deposited [16] … Lexicon of Cave and Karst Terminology