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Water (Oceans)
Submarine Canyons : They are deep valleys which have sharply oceanic floors. They occur along all the coasts of the world. Submarine canyons are of three types :
(i) The small gorges extend down from the edges of continental shelves to continental slopes.
(ii) The canyons situated at the mouths of rivers.
(iii) The canyons of dendritic appearance.
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