ABC soil Hear it!

ABC soil definition

ABC soil

a vertical section of soil made up of three distinct layers: the top layer (A-horizon) is mostly humus, the middle layer (B-horizon) is of clay and oxidized material, and the bottom layer (C-horizon) consists of loose rock and other mineral materials

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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