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General Fossil Fuels What are fossil fuels? Oil, natural gas, and coal are the main sources of energy for modern use. All of these fuels are classified as fossil fuels. They are hydrocarbon deposits because they contain hydrogen and carbon. Hydrocarbon molecules come in a variety of shapes and sizes, this is one of the things that make them so valuable because it allows them to be used in so many different ways. The reason they are called fossil fuels is because they are all made from decayed plants and animals that have been preserved in the earth's crust by pressure, bacterial processes and heat. It takes millions of years for these organisms to chemically change into fossil fuels. Fossil fuels are usually found below ground. Coal is either mined or dug out while oil and natural gas are pumped out. Coal is widely distributed and is easier to locate than oil...

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