Soil Formation review

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soil thats best for growing most types of plants, made up of clay, sand and silt

topsoil is the

subsoil is the

crumbly, dark brown mixture of humus clay, and other minerals

fields plowed along curves of slope to help slow runoff

dark colored substance in soil from decayed organic material

farmers leave dead weeds and stalks of previous years crops to return nutrients to soil

farmer plants different crops in a field each year