Soil is defined as a mixture of different-sized earth materials, such as gravel, sand, and silt, and organic material called humus. Humus is dark, musty smelling stuff from the decomposed remains of plant and animal life. Plants need air and water to grow.
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Soil is defined as a mixture of different-sized earth materials, such as gravel, sand, and silt, and organic material called humus. Humus is dark, musty smelling stuff from the decomposed remains of plant and animal life. Plants need air and water to grow.