Here's why:

* Island Arc: Mount Pelée is located on the island of Martinique in the Caribbean. This island, along with others in the Lesser Antilles, is part of an island arc. Island arcs are formed when an oceanic plate subducts (sinks) beneath another oceanic plate.

* Subduction Zone: The subduction zone, where the two plates collide, is responsible for the volcanic activity in the area. The denser plate (usually the older one) dives beneath the less dense plate, causing melting in the mantle and the creation of magma. This magma rises to the surface, forming volcanoes like Mount Pelée.

In summary: Mount Pelée is a result of a convergent boundary, specifically a subduction zone, where the Caribbean plate subducts beneath the North American plate. This process creates the volcanic activity that has shaped the island of Martinique.