* Subduction: One oceanic plate is denser than the other, so it subducts (sinks) beneath the other.
* Melting: As the subducting plate descends, it encounters increasing heat and pressure. This melts the surrounding mantle rock, generating magma.
* Volcanoes: The magma rises to the surface, erupting through the overlying plate and forming volcanoes. These volcanoes often occur in a chain, known as an island arc, parallel to the trench where subduction takes place.
Examples of volcanic island arcs formed at oceanic-oceanic convergent boundaries:
* The Mariana Islands (Western Pacific Ocean)
* The Aleutian Islands (Alaska)
* The Lesser Antilles (Caribbean Sea)
It's important to note that while volcanic island arcs are the dominant feature, other geological formations can also occur at these boundaries, including:
* Oceanic trenches: The deep depressions formed where the plates meet.
* Accretionary wedges: Accumulations of sediment scraped off the subducting plate and added to the overriding plate.
