Second Most Abundant Gas in Earth's Atmosphere
This page is the CodyCross answer for the clue below from Deserts of the world, Group 1611, Puzzle 3 (Death Valley).
Question is: Second Most Abundant Gas in Earth's Atmosphere
and the answer is: OXYGEN
Word Meaning:
OXYGEN — The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
Definitions from Wiktionary.