How are fossil fuels formed and what is the process behind their creation?

Fossil fuels are formed from the remains of ancient plants and animals that were buried under layers of sediment millions of years ago. Over time, the organic matter is subjected to high pressure and heat, which transforms it into coal, oil, or natural gas. This process, known as diagenesis, takes place over millions of years and results in the formation of fossil fuels that we use today for energy.