Energy Sources and Fossil Fuels

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Fossil Fuels

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Materials that formed as ancient plants and animals decayed underground.

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Coal

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A hard black substance that was formed by chemical changes transformed from plant stems and leaves.

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Petroleum

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A liquid fossil fuel formed by the decay of ancient plants and animals.

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Natural Gas

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A fossil fuel that occurs in the gas state.

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Uranium

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An element used by most nuclear power plants. Typically found in underground rocks. Uranium is a nonrenewable energy source.

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Nuclear Fuel

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The unstable elements that produce energy in power plants.