Destructive (convergent) plate boundaries

When two plates move towards each other, the denser oceanic plate is subducted under the lighter continental plate, forming a trench, triggering earthquakes, and creating magma that rises to form explosive composite volcanoes. Fold mountains also form. If two continental plates collide, the sediments between them are compressed and pushed up, forming fold mountains. In oceanic plate collisions, volcanic island arcs can form.