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American Heritage Dictionary:

A horizon

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n.
In ABC soil, the uppermost zone of soil, containing humus; topsoil. Also called zone of leaching.


Related answers

What is the line in the sky from horizon to horizon? Read answer...
How do a horizon and B horizon form? Read answer...
What is an horizon? Read answer...
Why does horizon b contain minerals from horizon a? Read answer...

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Streches from horizon to horizon?
How do the a horizon and b horizon form?
The B horizon is the layer the a horizon?
What do the a horizon and B horizon form?

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American Heritage Dictionary The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more

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Why a horizons often are darker that B horizons or C horizons?
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