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What are liquid crude oil and petroleum made from? A. small marine organisms B. small land-based organisms C. compressed rock and sediment D. decomposing inorganic matter
Liquid crude oil and petroleum are made from small marine organisms .
The formation of crude oil and petroleum took place millions of years ago when small marine organisms such as planktons died and sank to the bottom of the ocean and got buried under layers of sediments.
Under the conditions of high temperature, pressure and an absence of oxygen the organic matter derived from these small organisms got converted to the present day petroleum and crude oil.
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