Formation of Soil 12/4/15

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a mixture of sand, silt, soil, clay, rock and humus (plant and animal remains)
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soil
when forces on Earth breaks rocks apart or wear rock away
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weathering
the uppermost 5 to 20 cm of soil with a high concentration of organic matter and microorganisms where almost all of the biological activity in soil takes place
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topsoil
easily broken down by biological activity, especially bacteria in the soil
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biodegradable
to break down into smaller, more basic parts
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decompose
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