Volcanic activity is typically associated with divergent and convergent boundaries.
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Divergent boundaries: These occur where tectonic plates are moving apart from each other. As the plates separate, magma from below the Earth's crust can rise to fill the gap, leading to volcanic activity.
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Convergent boundaries: These occur where one tectonic plate is being forced beneath another (subduction). The subducted plate melts and can generate magma that rises to the surface, resulting in volcanic eruptions.
Hotspots are also associated with volcanic activity, as they occur in the middle of tectonic plates rather than at the boundaries.
In summary, while divergent and convergent boundaries are most directly associated with volcanic activity, hotspots are another significant source of volcanism.