Fossil Fuels consist mainly of Carbon and Hydrogen. When Fossil Fuels are combusted/burned, Oxygen combines with Carbon to form CO2 and with Hydrogen to form Water H2O. These reactions release heat, which we use for Energy. Fossil fuels include coal, Petroleum, Natural gas, Oil shales, Bitumens, Tar sands, and Heavy oils. All contain Carbon and were formed as a result of geologic processes acting on the remains of organic matter produced by photosynthesis, a process that began in the Archean Eon (4.0 billion to 2.5 billion years ago).

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