Definitions for a horizon
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Random House Webster's College Dictionary
A horizon(n.)
the topsoil in a soil profile.
Category: Geology
Origin of A horizon:
1935–40
Princeton's WordNet
A-horizon, A horizon(noun)
the top layer of a soil profile; usually contains humus
Citation
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"a horizon." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/a horizon>.

