A horizon
noun, geology
the topsoil in a soil profile.
also called zone of leaching.
compare b horizon, c horizon.
a horizon
noun
the top layer of a soil profile, usually dark-coloured and containing humus and from which soluble salts may have been leached see b horizon, c horizon
a horizon
in abc soil, the uppermost, darkest zone that is rich in organic matter. the upper section of the a horizon usually contains humus along with plant and animal matter in varying stages of decay. the middle section usually contains a high concentration of quartz or other minerals that remain following the leaching away of clay, iron, and aluminum. the lower section is typically transitional in nature between the a horizon and the b horizon. also called zone of leaching.
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