Question

How and when was oil formed?

Answer 1

Answer:

About 300 million years ago, these dead organic materials such as zooplankton and algae built up on the bottom of lakes and oceans in conditions where they couldn't decompose. The organic matter then changed into kerogen, which eventually turned into oil through heat and pressure.

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Answer 2

Answer:

The geological conditions that would eventually create petroleum formed millions of years ago, when plants, algae, and plankton drifted in oceans and shallow seas. These organisms sank to the seafloor at the end of their life cycle.