natural gas

noun
a combustible mixture of gaseous hydrocarbons that accumulates in porous sedimentary rocks, especially those yielding petroleum, consisting usually of over 80 percent methane together with minor amounts of ethane, propane, butane, nitrogen, and, sometimes, helium: used as a fuel and to make carbon black, acetylene, and synthesis gas.

Origin:
1815–25

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World English Dictionary
natural gas
 
n
a gaseous mixture consisting mainly of methane trapped below ground; used extensively as a fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
natural gas   (nāch'ər-əl)  Pronunciation Key 
A mixture of hydrocarbon gases that occurs naturally beneath the Earth's surface, often with or near petroleum deposits. Natural gas contains mostly of methane but also has varying amounts of ethane, propane, butane, and nitrogen. It is used as a fuel and in making organic compounds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Though the country is rich in natural gas, unemployment and homelessness are
  common.
Then he asked for some investment tips, perhaps something in natural gas.
But the low construction costs of natural gas plants makes it difficult for
  nuclear or renewables to compete with them.
Wage and price controls lasted nearly three years, and much longer for oil and
  natural gas.
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