90% of volcanic activity on earth occurs at either convergent or divergent plate boundaries. The remaining 10% occurs at hot spots, which are not associated with plate boundaries.
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Transform boundaries do not produce volcanic activity.
They both occur along plate boundaries.
Convergent
mantle plume
The hot spot volcanic activity is not dependent on the subduction and melting of oceanic crust. The hot spot simply appears to be a non-moving place in the Earth's mantle where heat rises from the interior.