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.


This is a web preview of the "The Handy Chemistry Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App