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2
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materials from the living organisms
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3
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when liquid soaks into soil
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4
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the soil underneath the topsoil that hold most of the chemicals that drip down from the topsoil
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5
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the layer of soil that is mostly comprised of broken up rocks
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6
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the uppermost layer of soil that is formed from the organic material that lies on top of it
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7
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how small or large an individual grain is
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8
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the hard rock that lies beneath all the soil layers
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