Answers

2015-06-22T19:49:11+05:30
They are formed due to several natural factors:
.Tectonic movements of the plate.
.Convergent plate-boundaries.
.Divergent plate boundaries.
.Transform plate boundaries.
.Hotspots.

hope it helps :)


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2015-06-25T17:24:20+05:30
They are formed due to
 i. tectonic movement
ii.covering of land volcanoes with water 

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