Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Environment Problems
In which one of the following geographical regions of India was 'Rat-Hole Mining’ prevalent until it was declared illegal by the National Green Tribunal?
1
North-east
2
South-west
3
North-west
4
More than one of the above
5
None of the above