How does the theory of continental drift explain the formation of the himalaya mountain ranges?

Millions of years ago, the Indian Continent was an island located off the coast of Australia. When the Pangea was starting to break apart due to the continental drift, the Indian continent moved and collided with the Asian continent. The Indian continent was denser than the Asian continent and resulted in the Indian plates moving beneath the Asian plates, which pushed the less denser Asian plates upwards. This resulted to the formation of the Himalayan Mountain Ranges.

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

Early in the story when tom finds an indian skull in the woods which he kicks in temper. the devil then makes his appearance and, as tom surveys him, he notices that the devil is neither "negro" nor "indian." in fact, he has a "swarthy" complexion and is "begrimed with soot."