this may be a dumb question but when I search their formation, they are are both dead organic matters that were buried long ago and subjected to pressure and heat. what separates them from turning into coal or petroleum?
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Life on our planet is based on carbon. When things die and stay in ground for a very long time under huge pressure, the molecules start acting in weird ways like breaking up and separating, arranging in specific ways, eventually carbon molecules start forming things like peat, coal, oil, etc.
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