Oxygen makes up only one-fifth of this on the earth Crossword Clue

Today's crossword puzzle clue is Oxygen makes up only one-fifth of this on the earth. Below is a list of potential answers to this specific crossword clue. Here are all the possible solutions for Oxygen makes up only one-fifth of this on the earth clue. The clue was last seen in New York Times crossword. Our database has 1 possible answer to this clue.

Likely answer:
air

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