Answer:
Petroleum is believed to be formed from organisms living in the sea. As these organisms die, their bodies settle at the bottom of the sea and gets covered with layers of sand and clay. Over millions of years, the dead organisms get transformed into petroleum, oil and natural gas and other fossil fuels under the conditions of the absence of air, high temperature and high pressure. Like coal, petroleum and natural gas are also fossil fuels. Since oil and gas are lighter than water and do not mix with it, they move upward. They are stopped by the overlying rocks which they cannot break through.
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