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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. A fossil
fuel, it is formed when large quantities of dead organisms, usually
zooplankton and algae, are buried underneath sedimentary rock and
undergo intense heat and pressure. Petroleum is recovered mostly
through oil drilling.
