Plate Tectonics Practice Test

When two oceanic plates converge, one of the plates typically subducts beneath the other due to differences in density. This subduction process can lead to the formation of an island arc. As the subducting oceanic plate descends into the mantle, it melts and causes magma to rise to the surface, often leading to volcanic activity. This volcanic activity, over time and repeated eruptions, can result in the development of a chain of volcanic islands, which is characteristic of an island arc.

The island arc forms parallel to the trench created by the converging plates, making this geological feature a direct consequence of the subduction process. It showcases how the interactions of tectonic plates can lead to significant geological formations in oceanic settings.