How is oil formed?

Answer 1

During periods of extreme global warming, which were mass extinction events both 90 and 150 million years ago, the oceans became stagnent, and most marine organisms died, sunk to the bottom and were buried by sediment.
Oil was formed from the remains of animals and plants (diatoms) that lived millions of years ago in a marine (water) environment before the dinosaurs. Over millions of years, the remains of these animals and plants were covered by layers of sand and silt. Heat and pressure from these layers helped the remains turn into what we today call crude oil. The word "petroleum" means "rock oil" or "oil from the earth"

Oil was formed from the remains of animals and plants that lived million years ago in a marine (water) environment before the dinosaurs.
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Answer 2

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