| http://www.w3.org/ns/prov#value | - Petroleum Petroleum (L. petroleum, from Greek: petra (rock) + Latin: oleum (oil)) or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. http://en.wikipedia.org/wiki/Petroleum 25.
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