Crossword Genius

C. 78% of the earth's atmosphere (8)

Ross

I believe the answer is:

nitrogen

(Other definitions for nitrogen that I've seen before include "Neon grit (anag.)" , "that's dominant in the air" , "Inert nog is an inert gas" , "Major constituent of air" , "Constituent of four fifths of earth's atmosphere" .)

I've seen this clue in The Guardian.
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