Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Environmental Studies Environment Ozone Depletion
“Ozone Hole” is a -
1
Hole in the atmosphere
2
Hole in the troposphere
3
Destruction of ozone layer
4
More than one of the above
5
None of the above