Which fossil fuel is formed under earth by the decomposition of vegetable matter lying under water by anaerobic bacteria in the absence of oxygen?
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A.
Natural gas
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B.
Coal
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C.
Crude oil
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D.
Petrol
Correct Answer:
A. Natural gas
Explanation:
The correct answer is Natural gas. Natural gas is a fossil fuel primarily composed of methane. It is formed deep underground through the anaerobic decomposition of organic materials, such as vegetable matter, by specialized bacteria in environments devoid of oxygen. This process typically occurs when plant and animal remains are buried under water and sediment, where they are subjected to intense heat and pressure over millions of years. While other fossil fuels share similar origins, their specific formation processes differ: - Coal is formed from the remains of terrestrial plants in swampy environments that turn into peat before being compressed into solid rock. - Crude oil originates mainly from ancient marine organisms like plankton and algae. - Petrol is a refined derivative of crude oil and does not occur naturally in the earth's crust.
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