Final answer:
Volcanoes are formed at plate boundaries and hotspots, not due to the Sun's radiation.
Explanation:
Volcanoes are primarily formed at plate boundaries and hotspots. They are not formed due to the Sun's radiation; rather, they are a result of subduction, rifting, and hot spots. Hotspots are the only type of volcanism not associated with subduction or rifting zones at plate boundaries, showing a unique formation mechanism.
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