Vocab for 4th Grade 4.7A Soils
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| clay | a fine-grained soil that retains water well
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| decomposition | the breaking down of plant and animal remains by decomposers
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| gravel | small, loose rock particles
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| humus | organic matter found in soil
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| loam | soil formed from equal parts of sand, silt, clay, and humus
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| nutrient | a substance that is necessary for healthy growth and development
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| properties | characteristics of matter
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| retain | to keep or stay behind
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| silt | a dust-like type of soil that retains water and circulates air well
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| soil | a mixture of air, water, minerals, and organic matter
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| weathering | the breaking down of larger rocks into smaller pieces called sediment
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| retention | the ability to keep or hold
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