Monsoon
Meet Bangladesh - Bangladesh 101:
Monsoon (Arabic mauism,”season”), wind that changes
direction with the change of seasons. The monsoon prevails mainly in the Indian
Ocean. It blows from the southwest, generally from April to October, and from
the opposite direction, the northeast, from October to April. The southwest, or
summer, monsoon is usually accompanied by heavy rain in areas of India and the
East Indies, constituting the dominant climate event of the area. The appearance
of this wind pattern over geological time has been linked, through sedimentary
evidence, to the uplift of the Himalayas and the Tibetan Plateau (Qing Zang
Gaoyuan) as the Indian subcontinent began to collide with the Asian crustal
plate about 20 million years ago. The northern land mass was high enough by
about 6 million years ago to cause air rising from the southern land mass to be
replaced by the monsoon, establishing this wind pattern.
Monsoons, in weaker form, also occur in other parts of the world.
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