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Petroleum is a fuel that is often called "crude oil" or "oil." Like natural gas and coal, petroleum is a fossil fuel. This means it was formed from the remains of plants and animals over an extremely long period of time. Heat and pressure eventually changed the remains of the animals into petroleum. All of the fossil fuels (petroleum, natural gas, and coal) are nonrenewable. This means once the supply is used up, they cannot be replaced. Pe