cONVERGENT Boundary
Since there are no proof that the size of the Earth has changed, old crust must be crushed, or recycled at the same time that new crust is being created at the divergent boundaries. The recycling of old crust takes place at boundaries where plates move toward each other. These boundaries are called convergent boundaries. The collisions that happen when plates come together are very slow and can last millions of years. When plates come together, one plate goes down under the other. The place where this happens is called a subduction zone. You can think of subduction as nature's way of recycling Earth's crust. The landforms are made at a convergent boundary depend on if an oceanic plate is combining with a continental plate, two oceanic plates are combining together or two continental plates are combining together.