UPSC Prelims 1996·GS1·geography·climatology

High temperature and low pressure over the Indian Subcontinent during the summer season, draws air from the Indian Ocean leading to the in blowing of the

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  1. ASoutheast monsoon
  2. BSouthwest monsoonCorrect
  3. CTrade winds
  4. DWesterlies

Explanation

The correct answer is B because during the summer, the intense heating of the Indian landmass creates a powerful low pressure center. Simultaneously, a high pressure cell exists over the Southern Indian Ocean. To balance this pressure gradient, air moves from the high pressure area over the ocean toward the low pressure area over the land. As these winds cross the equator, they are deflected to the right by the Coriolis force. This causes the winds to approach the Indian Subcontinent from a southwesterly direction. These moisture laden winds are known as the Southwest Monsoon, and they are responsible for the majority of rainfall in the region during the summer months.
geography: High temperature and low pressure over the Indian Subcontinent during the summer season, draws air from the Indian Ocean

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