The Abundant Gas in Saturn's Atmosphere
This page is the CodyCross answer for the clue below from Airport, Group 446, Puzzle 4 (Moving Walkway).
Question is: The Abundant Gas in Saturn's Atmosphere
and the answer is: HYDROGEN
Word Meaning:
HYDROGEN — (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
Definitions from Wiktionary.