Here's why:

* Convergent Boundary: This means two tectonic plates are moving towards each other.

* Subduction Zone: In this case, the denser oceanic plate is forced beneath the less dense continental plate. This process is called subduction.

* Volcanic Activity: The subducting oceanic plate melts as it descends, and the molten rock rises to the surface, creating volcanoes along the edge of the continental plate.

Some famous examples of subduction zones and their associated volcanoes include:

* The Andes Mountains in South America

* The Cascade Range in the Pacific Northwest of North America

* The Japanese Islands

Let me know if you have any more questions about plate tectonics!