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| ____________________ is any rock sufficiently enriched in one or more minerals to be mined profitably. |
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| Petroleum, coal, and natural gas are called ____________________ ____________________ because they formed from the remains of plants and animals that lived in the geologic past. |
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| ____________________ energy resources are replenished by natural processes as we use them. |
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| Evaporite deposits form by ____. |
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| The color of ____ is caused by precipitation of fine-grained metal sulfide minerals. |
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| ____ is formed as a residual deposit in warm climates. |
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| Coal reserves are thought to be sufficient to last a few ____. |
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| ____ releases no sulfur when burned, has a higher net energy yield than other fossil fuels, and can be extracted and used without refining. |
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| Tar sands are permeated with ____. |
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| The major fuel in nuclear power plants is an isotope of ____. |
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| A nonmetallic resource is: |
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| any useful rock or mineral that is not a metal, such as salt, building stone, sand, or gravel. |
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| In a placer deposit, gold settles out first when the stream current slows down because: |
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| gold is denser than any other mineral |
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| Placer ore deposits form: |
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| when streams or waves sort sediment according to density |
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| Most of the world's iron is mined from: |
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| can increase because new and inexpensive methods of processing lower grade ore can be developed and can become profitable if the price of the metal in a mineral deposit increases |
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| formed from the remains of plants and animals |
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| Mineral reserves remain constant over time. |
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| Fossil Fuels are renewable. |
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| Plant matter is composed mainly of carbon, hydrogen, and silicon. |
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| A solar cell produces energy directly from sunlight |
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