Question

how is petroleum was formed

Answer 1

Petroleum is a fossil fuel that was formed from the remains of ancient marine organisms. Millions of years ago, algae and plants lived in shallow seas. After dying and sinking to the seafloor, the organic material mixed with other sediments and was buried.
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Answer 2

it is formed by decomposition of plants and human dead bodies and it is finally formed from fractional distillation of crude oil

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