how is petroleum formed?
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Petroleum, also called crude oil, is a fossil fuel. ... Today, petroleum is found in vast underground reservoirs where ancient seas were located. Petroleum reservoirs can be found beneath land or the ocean floor. Their crude oil is extracted with giant drilling machines.
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Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria. ... Over millions of years under high pressure and high temperature, the remains of these organisms transformed into what we know today as fossil fuels.
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