GENERAL GEOLOGY

Detailed explanation-1: -A subduction zone is also generated when two oceanic plates collide-the older plate is forced under the younger one-and it leads to the formation of chains of volcanic islands known as island arcs.

Detailed explanation-2: -This process is called subduction. A deep ocean trench forms at this subduction boundary. As the subducting plate plunges deep into the mantle, it gets so hot it melts the surrounding rock. The molten rock rises through the crust and erupts at the surface of the overriding plate.

Detailed explanation-3: -These plates collide, slide past, and move apart from each other. Where they collide and one plate is thrust beneath another (a subduction zone), the most powerful earthquakes, tsunamis, volcanic eruptions, and landslides occur.

Detailed explanation-4: -Magma formed above a subducting plate slowly rise into the overriding crust and finally to the surface forming a volcanic arc, a chain of active volcanoes which parallels the deep ocean trench.

Detailed explanation-5: -Deep Ocean Trenches Long, deep caverns below the ocean’s surface are known as ocean trenches, which form when the subducting plate descends into the mantle creating a deep valley. Oceanic-continental convergent boundaries produce ocean trenches, as demonstrated along the west coast of South America.