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Though there is no single theory which can explain the origin of south-west monsoon, however, it is believed that the main mechanism is the differential heating of land and sea during:
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- Winter months
- Summer months
- Cyclonic storms
- South-west trade wind flow
Correct Option: B
According to the thermal theory, during the hot subtropical summers, the massive landmass of the Indian Peninsula heats up at a different rate than the surrounding seas, resulting in a pressure gradient from south to north. This causes the flow of moisture-laden winds from sea to land. On reaching land, these winds rise because of the geographical relief, cooling adiabatically and leading to Orographic rains, better known as the southwest monsoon.
