Question

how is coal and petroleum formed

Answer 1

Coal and petroleum have beenformed from remains of dead animals and plants which has been subjected to various biological and geological process. Coal is the remains of trees, ferns and other plants that lived millions of years ago. ... Bacteria attacked the dead remains and changed them into oil under high pressure.
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Answer 2

coal and petroleum have been formed from remains of dead animals and plants which has been subjected to various biological and geological process