MCQOPTIONS
Saved Bookmarks
| 1. |
Ozone hole refers to? |
| A. | Hole in ozone layer |
| B. | Decrease in the ozone layer in troposphere |
| C. | Decrease in thickness of ozone layer in stratosphere |
| D. | Increase in the thickness of ozone layer in troposphere |
| Answer» D. Increase in the thickness of ozone layer in troposphere | |