Christianity and Buddhism: in the early ages before Islam was even a religion, Chalcedonians ( the first morph of Christianity, before it was separated to Orthodox and Catholic ) ventured in Asia from 1 A.D. until 300 A.D. ( they where interrupted by the Sunni a branch of the Islamic religion )
The rock must be granite.
If upwelling stopped it would cause the food chain to break thus causing the fisheries to collapse