Oil and petroleum products explained - U.S. Energy Information
https://www.eia.gov/energyexplained/oil-and-petroleum-products/
WEBJun 12, 2023 · Crude oil and other hydrocarbons exist in liquid or gaseous form in underground pools, or reservoirs, in tiny spaces within sedimentary rocks and near the earth's surface in tar (or oil) sands. Petroleum products are fuels made from crude oil and the hydrocarbons contained in natural gas.
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