At which types of plate boundaries are volcanoes found? Why are they commonly found here?

Volcanoes are common along convergent and divergent plate boundaries, but are also found within lithospheric plates away from plate boundaries. Wherever mantle is able to melt, volcanoes may be the result. Volcanoes erupt because mantle rock melts.

Explanation:

Volcanoes are commonly found at the edges of Earth's moving tectonic plates or because the magma in between the plates is forced up, creating a volcano. The area between the plates is weak, making it easier for the magma to push through and volcanoes to form.