Petroleum: A naturally occurring yellowish-black liquid found in geological formations beneath Earth's surface. It is commonly refined into various types of fuels, including gasoline, diesel fuel, and kerosene.
Refining: The process of converting crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils.
Lamp Oil: A type of liquid paraffin as a fuel for lamps. Kerosene is often used as lamp oil.