JOHN KAPRIELIAN / SCIENCE PHOTO LIBRARY JOHN KAPRIELIAN / SCIENCE PHOTO LIBRARY
Combustion. Close-up of the flame coming from a domestic natural gas burner. Natural gas, together with coal and oil, is one of the world's three main fossil fuels. It is a gaseous mixture, consisting mainly of methane, found in the Earth's crust. Combustion occurs as a rapid exothermic chemical reaction between oxygen and the combustible elements of a fuel which, for natural gas, are carbon and hydrogen.
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