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| material that has a usuable amount of metal in it |
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| layers of sand, gravel, or bedrock that hold or move ground water |
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| methos of plowing in which farmers plow with the shape of the land |
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| farmland that is unused or allowed to rest for a season or a year. |
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| a low growing plant used to prevent erosion of topsoil |
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| all the Earth's water found in lakes, oceans, streams, rivers, soil, groundwater and air |
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| able to be dented or dented |
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| a solid substance found naturally in the earth's surface, has never been an organic substance |
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| the process of separating metal from the other materials in which it is found |
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