Questar corporation an energy developer engaged in oil and gas exploration and production gas processing and gathering gas and liquids trading interstate gas transmission and storage retail gas distribution and telecommunications and information technologies. Petroleum 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 includes natural gas and the viscous or solid form known as bitumen which is found in tar sands
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