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A horizon

   Also found in: Wikipedia 0.03 sec.
A horizon
n.
In ABC soil, the uppermost zone of soil, containing humus; topsoil. Also called zone of leaching.
A horizon
n
(Earth Sciences / Physical Geography) 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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.A horizonA horizon - the top layer of a soil profile; usually contains humus
A-horizon
humus - partially decomposed organic matter; the organic component of soil


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