Fossil Fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. In common dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources.
Summarize the following text into one or two sentences.
Fossil fuels are hydrocarbons formed from the remains of dead plants and animals which can include coal, fuel oil, natural gas and other sources.