The soil near the surface is usually dar...

The soil near the surface is usually darker then the soil about one water down. This is because the top soil is

A

Is richer in Ca and Mg

B

Contains more organic matter

C

Is wetter than the subsoil

D

Is drier than the subsoil

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The correct Answer is:

B

Topsoil contains decomposed and amorphous organic matter called humus.

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