Explain India caste system?

So if you think of a pyramid, the highest rank is on top, the order goes

1. Brahmins (highest rank or most respected) - priests, and the academic class

2. Kshatriyas - Rulers, administrators, and warriors

3. Vaishyas - artists, tradesmen, farmers, merchants

4. Shudras - commoners, peasants, servants

5. Dalits/outcastes/untouchables - street sweepers, latrine cleaners

Hope this helped a bit!

Except common history

Answer they are produced by collision of tectonic plates;