Earth’s Atmosphere Has More of This Than Oxygen

Puzzle 9 of Theatrical Performance Pack

Question is: Earth’s Atmosphere Has More of This Than Oxygen

and the answer is: NITROGEN

Word Meaning:

NITROGEN — (uncountable) The chemical element with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.

Definitions from Wiktionary.