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What is the major reason for decreasing monsoon rainfall from Kolkata towards Delhi?

Answer and explanation

Correct answer: Moist winds lose moisture while travelling a long distance

Rainfall decreases from Kolkata towards Delhi mainly because the Bay of Bengal branch of the southwest monsoon moves inland from east to west and gradually loses moisture. It rains over areas nearer the eastern side first. During the long journey towards Delhi, the winds continue to release water and therefore carry less moisture later. This produces a general westward decrease in rainfall across the northern plains, though local relief and individual weather systems may create small differences.

Option A is correct because it states the relevant process: moist winds lose moisture as they travel a long distance. Delhi is inland, not in the sea, and Kolkata is not a rain-shadow region. Snowfall does not normally block Delhi’s monsoon rainfall, and rain there is not limited to cyclones. The important geographical relationship is that distance from the moisture source and repeated rainfall along the route reduce the remaining moisture.

Related tags

ClimateIndian MonsoonDelhi Kolkata

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