UPSC GEOGRAPHY

■ ORIGIN OF CONTINENTAL SHELVES #Oceanography #Oceanrelief Different views have been expressed to explain the complex origin of continental shelves :- ◇ Continental shelves are basically the extended form of continental platforms. Marine waves and currents erode the continental margins and thus form extensive platforms which receive deposits of sediments brought down by the rivers and sea waves. ◇ Continental shelves are formed through prolonged deposition of detritus (under sea water) brought by the rivers alone. Such type of continental shelves is formed only in those areas where sea conditions are calm so that prolonged sedimentation goes on uninterruptedly resulting into subsidence and thus allowing more and more sedimentation. ◇ Rising thermal convective currents from beneath the continents and the ocean basins converge along the continent-ocean boundary and descend. The resultant compressive force causes subsidence of the continental margins and thus continental shelves are formed.

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