Question

how are nutrients put black in the soil​

Answer 1

The degradation of organic matter within the soil produces a substance called humus, which has a complex chemical structure and is composed of carbon-rich compounds that impart the dark color. These compounds also interact with the iron and manganese content of the soils.

Answer 2

Answer:

cattle eat grass

grass nutrients remain in their body ( matter can neither be created nor be destroyed you might have heard of)

when animals die microorganisms decompose their body's in simple nutrients.

This is how nutrients return back to soil.

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