Which is a leading theory for the formation of fossil fuels?

The most generally accepted explanation for fossil fuel production is that, over time, fossil fuel was formed from declining organic matter. Organisms died and were buried in the earth millions of years ago. The carbonaceous substances within the humans, subjected to the high temperature and pressure below the earth's surface, were converted into types of fossil fuel such as coal and oil.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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