Crossword puzzle clue "marsh gas essentially"

Here are the possible solutions for marsh gas essentially clue

Answer
Clue
Relevancy
methane
Clue
Marsh gas, essentially
Marsh gas
Marsh gas, mostly
Marsh gas, mainly
Marsh gas constituent
Swamp gas, essentially
Definition
a colourless odourless flammable gas, CH4, the simplest of the alkanes
neon
Clue
Gas in gas station signs
Definition
a gaseous element
actionherons
Clue
Birds who initiate lawsuits against marsh developers?

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