Eli5: Why is oil referred to as fossil fuel?
In: 3
if you take organic matter and put it into a pressure cooker, then slow roast it for millions of years, you get crude oil. it is literally the fossils of plants and animals. the key to forming it is the pressure cooker part that seals it away from other decomp processes. there needs to be an event that rather quickly sealed off a large amount of organic matter, like earthquake, volcano, etc.
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