Crossword Genius

Major component of the earth's atmosphere (8)

Ross

I believe the answer is:

nitrogen

(Other definitions for nitrogen that I've seen before include "Common gas, N" , "It makes up 78% of air" , "Major constituent of air" , "Inert nog is an inert gas" , "It forms the greater part of air" .)

I've seen this clue in the Sydney Morning Herald.
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