Glossary

Definitions from the Soil Science Society of America (SSSA)

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Horizon soilA layer of soil, approximately parallel to the surface, having distinct characteristics produced by soil-forming processes. In the identification of soil horizons, an uppercase letter represents the major horizons Numbers or lowercase letters that follow represent subdivisions of the major horizons. The major horizons are as follows:O,A,E,B,C,Cr,R.