What culture characteristics make south asia distinctive?

Asia is compose of Western Asia, Eastern,Southeastern,Northern,Central Asia and South Asia. A distinctive feature of South Asia is it's cultural diversity. Culture is a set of standards of a society of the acceptable behavior. Diversity is having a difference from the majority. Cultural diversity is vital since people can learn from each other. It can help one to recognize the differences and thus respect people because of it.

Except common history

Answer volcanic outgassing;