Crossword puzzle clue "upper atmospheric layer"

Here are the possible solutions for upper atmospheric layer clue

Answer
Clue
Relevancy
ozone
Clue
Upper atmospheric layer
Atmospheric layer
Endangered atmospheric layer
Thinning atmospheric layer
Certain atmospheric layer
Atmospheric layer with a "hole" in it
Atmospheric layer of note
Protective atmospheric layer
Definition
an allotropic form of oxygen present in the atmosphere

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