Ao horizon
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Ao horizon
(¦ā¦ō hə′rīz·ən)
(geology) That portion of the A horizon of a soil profile which is composed of pure humus.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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