1. Coal: Coal is a solid fossil fuel formed from the remains of plants that lived millions of years ago. It is found underground and is used to generate electricity, produce steel, and power industrial processes.
2. Oil: Oil, also known as petroleum, is a liquid fossil fuel formed from the remains of ancient marine organisms. It is found underground and is the primary fuel for transportation, heating, and industrial processes.
3. Natural Gas: Natural gas is a gaseous fossil fuel formed from the remains of ancient marine organisms. It is found underground and is used for heating, cooking, and electricity generation.