Petroleum
/pəˈtroʊliəm/
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Definition
(noun) A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface.
Sentence Examples
The present world owes its convenient life to petroleum.
The ecologist warned us that petroleum was not merely a blessing but also a curse.
CEFR Practice Quiz
The global economy is heavily dependent on ____ as a source of energy and raw materials.