Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Knowledge Indian Geography Indian Economic and Human Geography
Minerals that lie at shallow depths are taken out by removing the surface layer is called:
1
mining
2
open-cast mining
3
shaft mining
4
More than one of the above
5
None of the above