fossil fuels - fuels formed over millions of years from ancient plants and animals, coal - a solid fossil fuel formed by decaying plants, oil - a liquid mixture present in rock that is formed by decaying plants and animals, natural gas - a flammable gas present in rock that is formed by decaying plants and animals, an environment where coal is most likely formed, formation of fossil fuels - organism growth, burial, compaction, fossils - remains of dead plants and animals formed in sedimentary rocks, sediment - pieces of rock that bury dead organisms, decomposition - the process by which dead plants and animals decay or rot, organism - A living thing that grows, reproduces, and responds to its environment,

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