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GS Geography Physical Geography of World
Q.

Ozone-hole in the atmosphere is largely caused by the presence of:
Explanation:

ANS. (C) 
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. It is calculated that a CFC molecule takes an average of about five to seven years to go from the ground level up to the upper atmosphere, and it can stay there for about a century, destroying up to one hundred thousand ozone molecules during that time.

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