A natural non renewable fuel such as coal, oil, or natural gas formed over a very long time in the geological past from the remains of living organisms.
Fossil fuel
A flammable, yellow to black liquid composed of hydrocarbons occurring naturally beneath Earth's surface.
Petroleum (oil)
An energy source that takes millions of years to form from the remains of plants and animals, such as coal, oil, and natural gas.
Non-renewable
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