Question

what are the conditions to formation of fossils

Answer 1

Fossil fuel is a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years.

Answer 2

fossils are formed by decaying of plants and animals who buried under earth crust.
their bodies start decaying under high pressure and temperature and after that their body converted into fossils over millions of years.
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