By which process are fossil fuels formed?

They are formed by natural processes like anærobic decomposition. They contain energy from ancient photosynthesis. They can literally be around 650 million years old.

Frog is rorangutan is krhino is kfly is rshark is kremember! "k"aring kangaroo, "r"apid rabbit. rabbits have lots of babies at once and focus on numbers rather than quality. kangaroos have one at a time and focus on quality rather that numbers. also, rabbits go into heat very often, kangaroos do not go into heat that often. (a little tip from my bio teacher mr. kelly)