About 150km from a subduction zone.
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Volcanic arcs and oceanic trenches commonly form at subduction zones.
It can be found along subduction-related volcanic arcs or all by themselves
No. Volcanic eruptions can build mountains and form new land. Many occur in remote areas where there is not much to destroy.
Hot spot volcanos. As these age they can become island chains and eventually subsurface seamount arcs if the hot spot is in the ocean.
A compass is mainly used to draw perfect circles, but it can also be used to draw arcs of different sizes.