ABC Soil Definition

Soil in which A, B, and C horizons can be seen as three distinct layers in a vertical section.
American Heritage
A vertical section of soil made up of three distinct layers: the top layer (A-horizon) is mostly humus, the middle layer (B-horizon) is of clay and oxidized material, and the bottom layer (C-horizon) consists of loose rock and other mineral materials.
Webster's New World
(usually capitalized) Soil that has a well-differentiated profile, with the three types or horizons of soil.

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