ozone hole

Noun
  1. An area of the ozone layer (near the poles) that is seasonally depleted of ozone (synset 109405463)
    is a type of: hole - an opening into or through something
    is a part of: ozone layer, ozonosphere - a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun

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