What type of tectonic boundary is most likely to produce volcanic activity?

Volcanic activity is most commonly associated with convergent boundaries, where one tectonic plate is forced beneath another in a process known as subduction. This movement leads to the melting of the subducted plate and the generation of magma, which can rise to the surface, resulting in volcanic eruptions.

At convergent boundaries, particularly those that involve an oceanic plate colliding with a continental plate, the intense pressure and heat facilitate the formation of volcanic arcs, such as the Cascade Range in the United States.

In contrast, divergent boundaries primarily involve the seafloor spreading, which can create volcanic activity as magma rises to fill the gap between the separating plates, but it is generally less explosive than at convergent boundaries. Transform boundaries, characterized by lateral sliding of plates, do not typically cause volcanic eruptions as the plates do not converge or diverge in a manner that generates magma.

Thus, while all boundary types can have volcanic activity to some degree, convergent boundaries are the primary sites for significant volcanic eruptions due to the subduction process. This makes the choice of convergent boundary the correct answer in the context of the question regarding which type is most likely to produce volcanic activity.