Petroleum (crude oil), coal, and natural gas are all fossil fuels.
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One of the energy sources that is considered a fossil fuel is coal. Other examples include oil and natural gas. These resources are formed from the remains of dead plants and animals that lived millions of years ago and were subjected to high temperature and pressure over a long period of time. To determine if an energy source is a fossil fuel, you can look at its origin and formation process. In the case of coal, oil, and natural gas, they are derived from ancient organic matter, making them fossil fuels.
