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Question
Ozone hole refers to –
Options:
A .  Increased concentration of ozone          
B .  Reduction in the thickness of ozone layer in troposphere
C .  Reduction in the thickness of ozone layer in stratosphere            
D .  Hole in ozone layer
Answer: Option C
:
C
It refers to reduction in the thickness of ozone layer. As ozone layer exists in stratosphere, option (c) is the correct answer.

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