Discussion
Which of the following is not an island arc ?
Answer: B
The one that is not an island arc is the Hawaiian chain.
Island arcs form where one oceanic plate subducts beneath another: magma rising from the subducting plate builds a curved line of volcanic islands beside a deep trench. The Aleutian, Philippine and Japanese islands are all of this kind, around the Pacific Ring of Fire.
The Hawaiian Islands lie in the middle of the Pacific plate, far from any plate boundary. They formed as the plate moved over a stationary hotspot, producing a straight chain of volcanoes that grow older to the northwest, not an arc above a subduction zone.
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