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Why is the Aravalli range not very effective in increasing monsoon rainfall in Rajasthan?

Answer and explanation

Correct answer: Its direction is almost parallel to southwest monsoon winds

The direct answer is C. Mountains increase rainfall most effectively when moist winds meet them and are forced to rise. Rising air cools, water vapour condenses, clouds form, and rain may fall on the windward side. In much of Rajasthan, the Aravalli range runs roughly parallel to the southwest monsoon winds. Therefore the winds can pass along the range instead of being pushed strongly upward, so the range does not produce much additional rainfall. Option A is wrong because the Aravallis are in northwestern India, not the Bay of Bengal. Option B is false; they are not higher than the Himalaya. Option D is false because they are not permanently snow-covered. Option C correctly explains the direction and weak lifting effect. Memory cue: a mountain across the wind lifts air; a mountain parallel to the wind is less effective.

Related tags

ClimateIndian MonsoonAravalli

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