Here's a breakdown:
* Convergent Boundary: This is where two tectonic plates collide.
* Ocean to Convergent Boundary: In this case, one plate is oceanic and the other is either oceanic or continental. The denser oceanic plate subducts (dives) beneath the other.
* Volcanic Arc: As the oceanic plate descends, it melts due to the intense heat and pressure. This molten rock (magma) rises to the surface and erupts, forming a chain of volcanoes parallel to the subduction zone.
Examples of volcanic arcs:
* The Andes Mountains in South America: Formed by the Nazca Plate subducting beneath the South American Plate.
* The Aleutian Islands in Alaska: Formed by the Pacific Plate subducting beneath the North American Plate.
* The Japanese Islands: Formed by the Pacific Plate subducting beneath the Eurasian Plate.
