Convergent boundary
A convergent plate boundary is the boundary that occurs when two tectonic plates collide with each other.  This causes very large earth movements.  Plate collisions can produce earthquakes, volcanoes, the formation of mountains, and other geological events over time.  The Himalayas were formed by such a collision.  Earthquakes and volcanoes are common near convergent boundaries.  This is because of pressure, friction, and plate material melting in the mantle.