Fossil fuels are produced by the same geologic processes as in the past, but at a much slower rate. Fossil fuels such as coal, oil, and natural gas are formed from the remains of plants and animals that lived millions of years ago. These organic materials were buried under layers of sediment and over time, heat and pressure converted them into fossil fuels. This process still occurs today, but the formation of fossil fuels takes millions of years, making them a non-renewable resource.
