Methane or helium
Crossword Clue

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AnswerCrossword Clue
GASMethane or helium
GASEthane or methane
GASMethane or propane
FLAMMABLEGASButane or methane, e.g.
methyleneThe divalent radical or group ?CH2?, derived from methane by loss of two hydrogen atoms
biogasany gas fuel derived from the decay of organic matter, as the mixture of methane and carbon dioxide produced by the bacterial decomposition of sewage, manure, garbage, or plant crops
biogasesany gas fuel derived from the decay of organic matter, as the mixture of methane and carbon dioxide produced by the bacterial decomposition of sewage, manure, garbage, or plant crops