What's on, and in, the horizon?

Did you know that there are horizons in the soil? They're named O, A, B, and C. O is the top horizon. It's about an inch thick made up of dead stuff that breaks down and keeps the soil "O"- so healthy. The A horizon is topsoil that's alive with roots, tiny microstuff like bacteria and fungi, and all kinds of critters like me. The A horizon is "A-OK" with me. Number three is horizon B. Plants and animals have a tough time getting through B. Why? "B"- cause it's very hard. See horizon C? You see, horizon C has less living stuff in it than O, A, and B. C is parent material that's made up of the rock and soil that formed the three layers above it.

This technical information on natural resource conservation and related subjects was provided by the USDA/Natural Resources Conservation Service.  Providing this information does not constitute endorsement by the U.S. Department of Agriculture of any commercial products or services.

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