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ABSTRACf: The present shape of India is due to a combination of events that took place over geological time, including the breaking away of the Indian Plate from Australia and Antarctica, rifting and drifting between India and Madagascar along the west coast, and collision of the plate with the Asian continent. Following these tectonic events, eustastic changes have played a major role in modifying the east and west coasts ofIndia. Another factor responsible for both past and present regional changes is isostatic movement, resulting in uplift and subsidence, especially in deltaic areas.