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topsoil
Thin Humus layer, minerals deep beneath the surface
the two layers are sub soil The layer of soil that has little or no humus in it is the subsoil. The top layer of the soil has the most humus in it because the dead leaves fall from the plant and go back into the soil.
Humus
bed rock
topsoil.
Well, the A horizon is made up of topsoil, a crumbly, dark brown soil composed of humus, clay, and other minerals.
minerals
leaching
Humus is located in the top layer of soil. It is a type of organic soil matter and aids in nutrition retention in the soil.
topsoil
Humus