Crossword puzzle clue "gas in a layer"

Here are the possible solutions for gas in a layer clue

Answer
Clue
Relevancy
icing
Clue
Layer-cake layer
Definition
a sweet mixture for covering cakes
strata
Clue
Layer upon layer
tier
Clue
Layer cake layer
ozone
Clue
Gas in a layer
Gas in a stratospheric layer
Triatomic gas in a thinning layer ... and, symbolically, what appears in this puzzle's four longest answers
Gas in an atmospheric layer
Gas in a protective layer
Definition
an allotropic form of oxygen present in the atmosphere

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