Saturn Is Composed Mainly of Helium and This Gas

This page is the CodyCross answer for the clue below from Greece, Group 664, Puzzle 1 (World Heritage Sites).

Question is: Saturn Is Composed Mainly of Helium and This Gas

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.

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Saturn is composed mainly of helium and this gas — CodyCross Answer | CodyCross Solutions