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Petroleum, or crude oil, is a smelly, yellow-to-black liquid and is usually found in underground areas called reservoirs.
Oil was formed from the remains of animals and plants (diatoms) that lived millions of years ago in a marine (water) environment before the dinosaurs.

Petroleum - Wikipedia

en.wikipedia.org/wiki/Petroleum

Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface, which is commonly refined into various ...

What Is Petroleum? - American Association of Petroleum Geologists

www.aapg.org/about/petroleum-geology/petroleum-through-time/what-is-petroleum

There are some places on earth where oil is not trapped underground, but actually seeps out at the earth's surface—Think Jed Clampett and a "bubbling crude!

Petroleum | Information on Petroleum and Crude Oil

www.petroleum.co.uk/

Petroleum or crude oil is a fossil fuel. Find out how petroleum was formed and a history of its development into the oil products we see today.

What is the difference between crude oil, petroleum products, and ...

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Petroleum products are produced from the processing of crude oil and other liquids at petroleum refineries, from the extraction of liquid hydrocarbons at natural ...

Petroleum - New World Encyclopedia

www.newworldencyclopedia.org/entry/Petroleum

Petroleum (Latin Petroleum derived from Greek πέτρα (Latin petra) - rock + έλαιον (Latin oleum) - oil) or crude oil is a naturally occurring liquid found in ...

Petroleum | Define Petroleum at Dictionary.com

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Petroleum definition, an oily, thick, flammable, usually dark-colored liquid that is a form of bitumen or a mixture of various hydrocarbons, occurring naturally in ...

Petroleum | Definition of Petroleum by Merriam-Webster

www.merriam-webster.com/dictionary/petroleum

Define petroleum: a kind of oil that comes from below the ground and that is the source of gasoline and other products.

Petroleum - Oil and Natural Gas | energy4me

energy4me.org/all-about-energy/what-is-energy/energy-sources/petroleum/

Oil and natural gas together make petroleum. Petroleum, which is Latin for rock oil, is a fossil fuel, meaning it was made naturally from decaying prehistoric plant  ...

petroleum | Britannica.com

www.britannica.com/science/petroleum

Jul 18, 2012 ... Petroleum, complex mixture of hydrocarbons that occur in the Earth in liquid, gaseous, or solid forms. The term is often restricted to the liquid ...