Which best describes how fossil fuels form?
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a. natural gas is burned to form coal and oil.
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b. sunlight converts grass to coal and oil.
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c. farms are used to produce natural gas.
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d. decayed organisms are compressed underground,

Decayed organisms are compressed underground

Explanation:

Fossils are the remains of organisms that are buried in a rock during sediment deposition over long geological time period. Since the bodies of these organisms is made of organic compounds, the high pressure of the overlying rock turns them into the hydrocarbons or fossil fuels. Therefore, option D is correct.

On the other hand, options A-C are incorrect because of following reasons:

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