When convergent plates meet along oceanic crusts, the denser plate subducts (dives) beneath the less dense plate. This process creates several landforms, but the most prominent is a volcanic island arc.

Here's how it works:

1. Subduction: The denser plate (usually older and colder) sinks beneath the less dense plate.

2. Magma Formation: As the subducting plate descends, it melts due to the intense heat and pressure. This molten rock, called magma, rises towards the surface.

3. Volcanic Eruptions: The magma eventually erupts through the surface of the overriding plate, forming volcanoes.

4. Island Arc: Over time, numerous volcanoes emerge from the ocean floor, creating a chain of islands known as an island arc.

Examples of island arcs created by convergent plate boundaries with oceanic crust include:

* The Mariana Islands

* The Aleutian Islands

* The Japanese Islands

In addition to volcanic island arcs, other landforms associated with this type of convergent boundary include:

* Deep Ocean Trenches: These are deep depressions in the ocean floor formed where the subducting plate bends downwards.

* Forearc Basins: These are sedimentary basins located between the trench and the volcanic arc.

Let me know if you'd like more details on any of these features!