One type of convergent boundary occurs when an oceanic plate collides with a less dense continental plate. This happens at subduction zones, where the more dense plate sinks, or subducts, beneath the less dense plate. Mountains and volcanoes can occur at these subduction zones:

The Andes mountains, partially located on the Nazca plate in South America

Oceanic-Continental crust collision

The Karymsky volcano of the Kurile and Aleutian subduction zones in Kamchatka, Russia

Convergent Boundaries: