Petroleum | Energy, Products, & Facts | Britannica
https://www.britannica.com/science/petroleum
Nov 9, 2023 · Petroleum, complex mixture of hydrocarbons that occur in Earth in liquid, gaseous, or solid form. The term is often restricted to the liquid form, commonly called crude oil, but, as a technical term, ‘petroleum’ also refers to natural gas and the viscous or solid form known as bitumen, which is found in tar sands.Web
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