The type of landform that develops at plate boundaries where one oceanic plate descends beneath another is a subduction zone. This process results in the formation of:

* Volcanic arcs: Chains of volcanoes that form on the overriding plate. The magma that fuels these volcanoes originates from the melting of the subducting plate.

* Trench: A deep, narrow depression in the ocean floor that marks the point where the two plates meet.

* Island arcs: Chains of islands that form parallel to the trench and volcanic arc.

* Earthquakes: Subduction zones are the sites of the most powerful earthquakes on Earth.

The classic example of this process is the Ring of Fire, a zone of intense seismic and volcanic activity that surrounds the Pacific Ocean.