What do fossill fuels manly consist of?

Fossil fuels mainly consist of hydrocarbons, which are organic compounds made primarily of carbon and hydrogen. They are formed from the ancient remains of plants and animals that were subjected to heat and pressure over millions of years. The three primary types of fossil fuels are coal, oil, and natural gas, each varying in composition and energy content. These fuels are widely used for energy production, transportation, and industrial processes.