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It's called humus.
a mixture of weatherted rock and humus would usually be refered to as a soil. However, there are many different classifications for what a soil actually is, and there are many different types of soil. It is also true than any weathered material on the surface of the earth can be called regolith.
No, Humus is made from dead organic plants and animals.
No, it is a mixture
the decaying matter in soil is called humus.
If the rock has been eroded into grains, then the mixture is known as top soil.
yes
Additional answer No, it's both. A mixture is a substance, and so is an element a substance. All matter is a substance whether it's a mixture or not.
Humus.
Humus
It is called humus.
The formation of complex organic matter in soil is called Humus