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Encyclopedic overview
Island arcs are long chains of active volcanoes with intense seismic activity found along convergent tectonic plate boundaries. Most island arcs originate on oceanic crust and have resulted from the descent of the lithosphere into the mantle along the subduction zone. They are the principal way by which continental growth is achieved.
The Ryukyu Islands form an island arc.
Excerpted from Wikipedia’s “island arc” article, available under the CC BY-SA 4.0 licence.