Convergent boundaries are plate boundaries where two plates are in motion towards one another. When twoplates are moving towards each other they will either form a Subduction Zone or a Continental Collision.

Subduction Zone: Below is a picture of a subduction zone. In the subduction zone the more dense oceanic plate is being forced underneath the less dense continental plate. When the oceanic plate subducts it is pushed down inside the earth until it gets too hot and the oceanic crust melts. When the crust melts the magma rises and produces volcanoes. When there is enough pressure from the magma the volcanoe may erupt!

An example of a subduction zone is the Pacific Plate and the Juan De Fuca Plate which produce the Cascade Mountains. Click Here for a visual.

Continental Collision: Below is a picture of a continental collison. In this diagram both of the plates are too light to sink, so instead they push against eachother creating the largest mountains seen in the world (The Himalayas)