Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Knowledge Geography (World Geography) World Economic and Human Geography
Who has introduced the concept of a world island surrounding the heartland of the world?
1
Van Valkenburg
2
Von Thunen
3
Mackinder
4
More than one of the above
5
None of the above