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Wikipedia: Petroleum (L. petroleum, from Greek πετρέλαιον, lit. "rock oil") or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights, and other organic compounds, that are found in geologic formations beneath the earth's surface. The term "petroleum" was first used in the treatise De Natura Fossilium, published in 1546 by the German mineralogist Georg Bauer, also known as Georgius Agricola.
![[A sample of medium heavy crude oil]](http://images.ookaboo.com/photo/s/Petroleum_s.jpg "A sample of medium heavy crude oil")
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![[Oil derrick in Okemah, Oklahoma, 1922.]](http://images.ookaboo.com/photo/s/Gusher_Okemah_OK_1922_s.jpg "Oil derrick in Okemah, Oklahoma, 1922.")
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 from Magnus_Manske |
 from PlainEarth |
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