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Ozone hole refers to (a) Increase in concentration of ozone (b) Hole in ozone layer

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Ozone hole refers to 

(a) Increase in concentration of ozone 

(b) Hole in ozone layer 

(c) Reduction in thickness of ozone layer in troposphere 

(d) Reduction in thickness of ozone layer in stratsophere

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Correct option: (d) Reduction in thickness of ozone layer in stratsophere

Explanation:

Ozone hole is reduction in ozone layer in stratosphere.

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