Traditional Culture Encyclopedia - Traditional stories - I can't figure out the types, sources, uses and components of fossil fuels.

I can't figure out the types, sources, uses and components of fossil fuels.

The main fossil fuels are coal and oil, and now they also include natural gas (actually a by-product of oil).

Coal: The source is that ancient trees sank into the mud due to geological activities. After a long period of mineralization (which is likely to be the case), the organic matter in plants is replaced by something with high C content, which is called coal, mainly composed of C and a part of S.

Petroleum: It is replaced by organic components of animals, and its main component is 12 liquid alkanes with more than C atoms.