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1. Soil horizon (A horizon, B horizon, C horizon)
A distinct layer of soil, more or less parallel with the soil surface, having similar properties such as color, texture and permeability; the soil profile is subdivided into the following major horizons: * A-horizon, characterized by an accumulation of organic material; * B-horizon, characterized by relative accumulation of clay iron, organic matter or aluminum; * C-horizon, the undisturbed and unaltered parent material. (Some soils have an E-horizon, characterized by leaching of organic and other material.)

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