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Why does rainfall distribution change when the position of the monsoon trough changes?

Answer and explanation

Correct answer: The active rain belt changes its position

The monsoon trough is an elongated zone of relatively low pressure. Its position helps determine where moist air rises and where clouds and rain become active. When the trough shifts north or south, the active rain belt also shifts. The region under or near the active belt may receive heavier rain, while another region may experience reduced rainfall or a break. Therefore rainfall is not distributed equally across the country during the entire monsoon season.

Option A is correct because a change in the trough’s position moves the active rain-bearing belt. The Sun does not change size for this reason, seawater does not disappear, and Earth’s rotation does not stop. The question tests the relationship between atmospheric pressure patterns and rainfall location. Understanding the trough as a shifting zone makes it clear why one area can receive rain while another becomes comparatively dry.

Related tags

ClimateIndian MonsoonMonsoon Trough

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