ABC soil

a soil with distinct A, B, and C horizons. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
ABC soil   (ā'bē-sē')  Pronunciation Key 

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Soil in which A, B, and C horizons can be seen as three distinct layers in vertical section.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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