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Created page with "== Introduction == Crude oil, also known as petroleum, is a naturally occurring, unrefined hydrocarbon liquid found in geological formations beneath the Earth's surface. It is composed of a complex mixture of hydrocarbons of various molecular weights and other organic compounds. Crude oil is a primary source of energy and a critical raw material for the petrochemical industry. == Composition == Crude oil is primarily composed of hydrocarbons, which are molecules made u..."