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en.wikipedia.org/wiki/Petroleum

Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations ..... Crude oil may also be found in a semi-solid form mixed with sand and water, as in the Athabasca oil sands in Canada, where it is usually referred to as ...

www.bbc.co.uk/bitesize/standard/chemistry/materialsfromoil/how_crude_oil_was_formed/revision/1

Crude oil - sometimes called petroleum - is found in the Earth's crust. Millions of years ago small animals and plants died and fell to the bottom of the sea.

oilprice.com/Energy/Crude-Oil/What-Is-Crude-Oil-A-Detailed-Explanation-On-This-Essential-Fossil-Fuel.html

Jul 24, 2009 ... Crude oil, commonly known as petroleum, is a liquid found within the Earth comprised of hydrocarbons, organic compounds and small amounts ...

energy.gov/sites/prod/files/2013/04/f0/HS_Oil_Studyguide_draft2.pdf

Oil. Fossil Energy Study Guide: Oil. Petroleum—or crude oil—is a fossil fuel that is found in large quantities beneath the Earth's surface and is often used as a ...

www.nationalgeographic.org/encyclopedia/petroleum

Jan 15, 2013 ... Petroleum, or crude oil, is a fossil fuel and non-renewable source of ... There are huge quantities of petroleum found under Earth's surface and ...

www.world-petroleum.org/edu/222-how-do-we-get-oil-and-gas-out-of-the-ground

The liquids found underground can be a complicated mixture of water, crude oil and gas. The crude oil and gas need to be separated before they can be ...

www.livescience.com/9404-mysterious-origin-supply-oil.html

Oct 10, 2005 ... But where does oil really come from, and how much is left? ... If abiogenic petroleum sources are indeed found to be abundant, it would mean ... objects formed from the same raw material as Earth, that crude oil might exist on ...

hubpages.com/education/how-oil-is-found

Dec 25, 2016 ... How do they find oil? What are some of the processes when they do find oil? ... Here is a brief run down on how crude oil is made into gas.

www.scientificamerican.com/article/why-is-oil-usually-found

Plate tectonics determines the location of oil and gas reservoirs and is the best key we have to understanding why deserts and arctic areas seem to hold the ...