Refining is *
1 point
Extracting Petroleum gas
Separation of various fractions of Petroleum
Heating of coal
Sedimentation of fossil fuel
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Refining is the process of reducing the impurities in a substance. You can't turn crude oil into gasoline without first refining it. Refining is nowadays most commonly associated with the processing of petroleum products such as oil and gas, but it also applies to precious metals, especially those used in jewelry.
Separation of various fractions of Petroleum is your answer
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