1. Petroleum (Crude Oil): Petroleum is a naturally occurring hydrocarbon liquid that is found in underground reservoirs. It is the most widely used fossil fuel and is refined to produce gasoline, diesel, and other petroleum products.
2. Natural Gas: Natural gas is a mixture of hydrocarbons, mainly methane, that is found underground. It is typically used for heating, generating electricity, and as a fuel for vehicles, especially in compressed natural gas (CNG) vehicles.
3. Coal: Coal is a solid fossil fuel formed from the remains of ancient plants that were buried underground over millions of years. It is primarily used to generate electricity and is a major source of energy for power plants around the world.
4. Propane: Propane is a liquefied petroleum gas (LPG) that is obtained from natural gas processing and petroleum refining. It is often used as a heating fuel for homes and businesses, as well as a fuel for vehicles, such as propane-powered automobiles and trucks.
