Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Knowledge Geography (World Geography) Geomorphology
What is a coarse-grained, dark-coloured, intrusive igneous rock that is widely used as a concrete aggregate, road base material, and crushed stone for railroad ballast?
1
Quartzite
2
Conglomerate
3
Gabbro
4
More than one of the above
5
None of the above