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                              Q:
                           
                           
                                                      | A) Tibet | B) Sweden | 
| C) Northern hemisohere | D) Antarctica | 
                              Answer:   A) Tibet
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Second ozone hole was detected over Tibet in the year 2006.
Ozone is a form of oxygen, acts as a high-altitude atmospheric screen against cancer-causing ultraviolet light.
The main source of these halogens in the stratosphere is photodissociation of man made halocarbon refrigerants, solvents, propellants and CFC's.
 
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