Naturally Scent-Free Gas Used as a Fuel
This page is the CodyCross answer for the clue below from Pet Shop, Group 351, Puzzle 5 (Chinchillas).
Question is: Naturally Scent-Free Gas Used as a Fuel
and the answer is: METHANE
Word Meaning:
METHANE — (organic chemistry, uncountable) The simplest aliphatic hydrocarbon, CH₄, being a constituent of natural gas, and one of the most abundant greenhouse gases.
Definitions from Wiktionary.