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Energy

Energy Sources

What is crude oil?

Crude oil is the oil that is found underground in natural reserves. It is formed from the natural decay of living things that were in the sea millions of years ago, which is why it’s commonly called a “fossil fuel.” The key ingredient that makes oil a valuable energy source is hydrocarbons. As we discussed briefly in “Chemical Reactions,” hydrocarbons release substantial amounts of energy when they undergo combustion reactions.



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