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Unit 7 vocabulary 1

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Across
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The resources that earth provides
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Resources that you can not replace when they run out such as coal ,oil and natural oil.
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Resources that never run out
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A mixture of gravel ,sand,and crushed stone that mixes near earths surface
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Pollutants in air become harmful to human health
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The material left after the ore is extracted
Down
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Occurs when salt water is distilled
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Substances that can affect your health
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The replacement of renewable resources at the same rate they are consumed
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The process where productive land becomes desert
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Solid rock underneath the parent rock
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A natural resource that can be mined at a profit ,ex : gold