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A-Horizon / Top-Soil
The A-horizon is made up of Humus, organic matter, water and air. This is the layers of soil that supports most organisms being very fertile.
The B-horizon is made up silt, clay and sand. This layer is less fertile than the A-horizon with little organic matter being present.
B-Horizon / Sub-Soil
The C-horizon is made up of weathered parent rock and little humus. This layer possesses very little to no organic matter being very infertile and supporting few organisms.
C-Horizon / Parent Material
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