Subduction is when two oceanic plates collide, the younger of the two plates, because it is less dense.
Volcanic Island Arcs a curving chain of active volcanoes formed above a subduction zone and adjacent to a convergent plate boundary.
Continental Volcanic Arc is a chain of volcanoes positioned in an arc shape as seen from above. It is formed when the oceanic crust is forced beneath the continental crust on an adjacent plate, creating an arc-shaped mountain belt.
Orogenesis is the process of mountain building, occurs when two tectonic plates collide