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island arc
island arcn. A usually curved chain of volcanic islands occurring on the overriding tectonic plate of a subduction zone, bounded on the convex side by a deep oceanic trench, and formed by magma that rises from the melting of the descending plate.island arc n (Physical Geography) an arc-shaped chain of islands, such as the Aleutian Islands or the Japanese Islands, usually lying at the edge of a Benioff zone, indicating volcanic activity where the oceanic lithosphere is descending into the earth's interior is·land arc (ī′lənd) A usually curved chain of volcanic islands occurring at a subduction zone. The chain occurs in the plate that rides over the subducting plate. It is curved because of the curvature of the Earth.island arc
island arc[′ī·lənd ¦ärk] (geography) A group of volcanic islands, usually situated in a curving arch-like pattern that is convex toward the open ocean, having a deep trench or trough on the convex side and usually enclosing a deep basin on the concave side; formed by volcanic activity associated with oceanic plate subduction at convergent plate margins. Also known as volcanic arc. |