Answer:
In a convergent plate boundary, two plates move towards one another. Due to this collision, the denser plate sinks below the less denser plate. It is marked by a subduction zone and deep-sea trench. Deep focus earthquakes originate in these regions. due to the high temperature and pressure at greater depth, partial melting takes place, as a result of which the plate melts and the magma being less dense, rises up towards the surface in the over-riding plate, forming volcanoes or chain of volcanic islands.
The San Andes Mountain also has formed in this way, by sharing a convergent plate boundary, where the denser Pacific plate (Oceanic crust) is subducting beneath the less dense South American plate (Continental plate).
