Term
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Definition
| broken down plant and animal material into a mixture |
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Term
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Definition
| downward movement of mineral and humus in soils |
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Term
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Definition
| plowing across the hill rather than up and down the hill |
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Term
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Definition
| condition in which soil become nearly useless for farming |
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Term
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Definition
| planting different crops in alternating years |
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Term
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Definition
| water that is artificially supplied to the land |
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Term
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Definition
| salt build up in the soil |
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Term
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Definition
| destruction or loss of forests |
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Term
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Definition
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Term
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Definition
| polluted rain that can damage trees and kill fish in lakes |
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Term
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Definition
| artificial channels for transporting water |
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Term
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Definition
| rock layers where ground water is plentiful |
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Term
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Definition
| ground water that is not replenished by rain |
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Term
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Definition
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Term
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Definition
| energy resources formed from the remains of ancient plants and animals, including coal, natural gas, and petroleum |
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Term
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Definition
| certain products made from oil |
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Term
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Definition
| electricity produced by moving water |
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Term
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Definition
| heat of the earths interior |
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