Millions of years ago when dead and decaying bodies of plants ,animals ,bacterias and someother microorganisms get buriedunder the soil and remains under the soil for millions of the years .Due to pressure ,temperature,weathering and other reasons they get converted into Fossils fuels .In simpler words :Dead reamains of the organisms is known as Fossil .
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Answer:
a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
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Solution:
Millions of years ago when dead and decaying bodies of plants , animals , bacterias and some other microorganisms get buried under the soil and remains under the soil for millions of the years .Due to pressure , temperature, weathering and other reasons they get converted into Fossils fuels .In simpler words : Dead reamains of the organisms is known as Fossil .
For eg : Petroleum, coal , diesel etc.