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A horizonThe A horizon is the layer of soil near the surface, and is roughly equivalent to topsoil. Plant roots and seeds grow in this layer, which is primarily composed of humus and minerals. The A horizon is below the O horizon and above the B horizon. External linkThe contents of this article are licensed from Wikipedia.org under the GNU Free Documentation License.
How to see transparent copy 01-04-2007 01:21:04 |
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