Answer:
Step-by-step explanation:
Island arcs are created through subduction, a process that occurs at convergent plate boundaries. In subduction, one tectonic plate, usually an oceanic plate, is forced beneath another plate. As the descending plate sinks into the Earth's mantle, it starts to melt, forming magma.
The magma rises to the surface, creating volcanic activity and the formation of volcanic islands. Over time, repeated volcanic eruptions and the accumulation of lava and volcanic materials build up the islands, forming an arc-shaped chain.
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