natural gas
US /ˌnætʃ.ər.əl ˈɡæs/
UK /ˌnætʃ.ər.əl ˈɡæs/
1.
flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as fuel.
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Many homes are heated with natural gas.
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The country has vast reserves of natural gas.