 The molten middle crust was therefore able to break through the upper crust and flow outward to the surface.The dilemma is that the South Asian monsoon was believed to have originated from topographic rise of the Himalayas and Tibetan Plateau.The channel flow model predicts that the rise of Tibetan Plateau requires the presence of Sotuh Asian monsoon, which leaves the Himalayas as the only possible candidate responsible for initiating the monsoon system.