What does the term 'ozone hole' refer to?

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(C) The term 'ozone hole' does not refer to an actual physical hole in the atmosphere. Instead,it refers to a significant thinning or decrease in the

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$A$ significant decrease in the concentration of ozone in the stratosphere

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(C) The term 'ozone hole' does not refer to an actual physical hole in the atmosphere. Instead,it refers to a significant thinning or decrease in the concentration of ozone $(O_3)$ in the stratosphere,particularly over the Antarctic region. This depletion is primarily caused by the release of chlorofluorocarbons $(CFCs)$ and other ozone-depleting substances.

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