Island Arcs – UPSC Prelims

  • They are long, curved chains of oceanic islands associated with intense volcanic and seismic activity and orogenic (mountain-building) processes.
  • An island arc typically has a land mass or a partially enclosed, unusually shallow sea on its concave side.
  • Along the convex side there almost invariably exists a long, narrow deep-sea trench.
  • The greatest ocean depths are found in these depressions of the seafloor, as in the case of the Mariana (deepest trench in the world) and Tonga trenches.
  • Prime examples of this form of geologic feature include the Aleutian-Alaska Arc and the Kuril-Kamchatka Arc.

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