Monsoons are seasonal climate conditions resulting from changes in wind that bring extreme drought or rain, depending upon the time of year. Those occurring in south Asia and east Asia are affected by a combination of atmospheric and oceanographic conditions. The Asian and African mountain belts in the area also impact monsoon formation. Today, monsoons support local livelihoods by providing rain to sustain harvests, but they also bring devastating droughts and floods that damage infrastructure and threaten life.
Click here for original story, Climate modeling suggests monsoon origination up to 40 million years ago
Source: Phys.org