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Topsoil contains organic matter (humus)
Humus
by earthworms in it
Humus A+
topsoil is the top layer. its a mixture of small rock pieces, humus, and other organic material. most living things are in the topsoil. rain sinks into the topsoil. it carries minerals to the subsoil (2nd layer)
topsoil
topsoil
plants and humus
topsoil
Humus
Topsoil has more organic matter in it than the rest of the soil. Decomposed organic matter (humus) is usually dark brown or black.
topsoil.