Petroleum: nm Petroleum is natural mineral oil (liquid bitumen) accumulated in deposits and used as a source of energy.
Oil reserves.
Petroleum, a mixture of hydrocarbons, comes from organic muds transformed by the action of anaerobic fermentations.
Oil fields in Texas, Venezuela, the Middle East, the North Sea (Brent).
Romanian and Saharan oil. Oil-exporting monarchies (black gold; petromonarchy).
The Organization of Countries and...
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