“Monsoon,” is Arabic in origin, their word for season. Wind systems are prone to seasonal reversals, the spawn of temperature variations between continents and oceans. Traders’ southeastern winds of the Indian Ocean produce a summer deluge as they move onshore, crossing the Indian continent before losing moisture on the slopes of the Aravalli Range. Monsoon deserts such as the Rajasthan of India and Thar Desert of Pakistan spread where dry regions are born west of the range.
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