Q: 9 (IAS/2011)

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The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?
question_subject: 
Ecology
question_year: 
2011
question_exam: 
IAS
question_sub_subject: 
Ecology
question_topic: 
Ecology
stats: 
0,8656,7328,1176,8656,1576,4576