Crossword puzzle clue "thinning atmospheric layer"

Here are the possible solutions for thinning atmospheric layer clue

Answer
Clue
Relevancy
ozone
Clue
Thinning atmospheric layer
Thinning layer
Triatomic gas in a thinning layer ... and, symbolically, what appears in this puzzle's four longest answers
Atmospheric layer
Endangered atmospheric layer
Upper atmospheric layer
Certain atmospheric layer
Atmospheric layer with a "hole" in it
Definition
an allotropic form of oxygen present in the atmosphere

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