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Carbon is also found in coal, petroleum, and natural gas. Carbon is one of the most important elements on the periodic table (at least from the perspective of organic chemists!).
Crude oil is an example of petroleum, which consists of mixtures of hydrocarbons and variable amounts of sulfur, nitrogen, and oxygen containing compounds. In contrast to crude oil, Shale oil is a non-petroleum fuel, which naturally exist in a solid state as an oil shale rock or kerogen.