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Natural gas is a compound formed by the decomposition of organic material beneath the surface of the earth.
In some places, gas escapes from small gaps in the rocks into the air; then, if there is enough activation energy from lightning or a fire, it burns.

en.wikipedia.org/wiki/Natural_gas

Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, .... Town gas is a flammable gaseous fuel made by the destructive distillation of coal. It contains a variety of calorific gases including hydrogen, carbon ...

www.nwnatural.com/Safety/GasEducation/TheStoryOfNaturalGas

Natural gas is composed mostly of methane, but it also contains small amounts of ethane, propane, butane, and pentane. Methane, a combination of hydrogen ...

www.alliantenergykids.com/EnergyBasics/AllAboutNaturalGas/000511

How Natural Gas Is Made. The natural gas that we use to heat our homes and our water comes from deep under the earth. The gas is found in layers of rock with ...

www.ucsusa.org/clean-energy/coal-and-other-fossil-fuels/how-is-natural-gas-formed

This comprehensive overview explains the basics of how natural gas is formed and where it can be found in the United States and around the world.

www.eia.gov/KIDS/energy.cfm?page=natural_gas_home-basics

Natural gas also occurs in coal deposits and is called coal bed methane. .... and synthetic natural gas (natural gas made from petroleum hydrocarbons or from ...

www.eia.gov/energyexplained/?page=natural_gas_home

What is natural gas? Natural gas occurs deep beneath the earth's surface. Natural gas consists mainly of methane, a compound with one carbon atom and four ...

www.ems.psu.edu/~pisupati/ACSOutreach/Natural_Gas.html

Energy Use at a Glance: Text Box: Source: Energy Information Administration In 2006, the U.S. consumed about 22 trillion cubic feet of natural gas (21% of the ...

www.aga.org/what-natural-gas

Natural gas is a fossil fuel composed almost entirely of methane, but does contain small amounts of other gases, including ethane, propane, butane and pentane ...

www.madehow.com/Volume-6/Natural-Gas.html

Natural gas is a mixture of combustible gases formed underground by the decomposition of organic materials in plant and animal. It is usually found in areas ...