An island arc is a type of archipelago that forms as a result of volcanic activity at convergent tectonic plate boundaries, specifically where an oceanic plate subducts beneath another oceanic plate. This geological process occurs when one tectonic plate moves under another and sinks into the mantle, leading to melting and the formation of magma. As the magma rises to the surface, it can create a series of volcanoes that emerge above sea level, leading to the development of islands.
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