Energy

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Fossil fuels are coal, petroleum, and natural gas. They were formed by the decomposition and alteration of plant and animal remains over millions of years in the absence of oxygen.

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They are called non-renewable because they exist in limited supply on human time scales and cannot be replaced quickly after use.

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Large plants gradually became coal, while small plants and animals became petroleum and natural gas after being buried under mud and sand, away from oxygen, where pressure, heat, and bacteria changed …

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Oil, also called petroleum, is the most widely used fossil fuel.

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Coal was historically the first fossil fuel used in the Industrial Revolution of the 1800s, so it played a major role in powering early industry and transport.

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Coal is mainly used as a solid fuel to produce electricity and heat through combustion.

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Natural gas is composed primarily of methane, about 85 to 90 percent.

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Natural gas burns more cleanly and, when used as CNG, it is lead-free and sulphur-free, so it reduces harmful engine emissions.