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4 Cards in this Set
- Front
- Back
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atmosphere |
The atmosphere of the Earth is roughly eighty percent nitrogen and twenty percent oxygen, with traces of other gases.
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Ground water |
water held underground in the soil or in pores and crevices in rock.
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soils |
the upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.
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Fertilizers |
any substance used to fertilize the soil, especially a commercial or chemical manure.
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