Final answer:
The Mariana Subduction Zone is an example of a convergent boundary where one oceanic plate subducts under another, leading to ocean trenches and volcanic activity.
Step-by-step explanation:
The Mariana Subduction Zone is an example of convergence where an oceanic plate subducts beneath another plate, specifically in this case, the Pacific Plate subducting beneath the Mariana Plate. In a convergent boundary, two tectonic plates collide, and one plate is forced beneath the other. In this case, the Pacific plate is subducting beneath the Philippine Sea plate, creating the Mariana Trench, which is the deepest part of the world's oceans.This type of boundary is called a convergent boundary, and it is one where the denser oceanic plate descends into the mantle, eventually melting and being recycled in the deeper layers of the Earth. This process is responsible for features like ocean trenches and volcanic activity along the subduction zone, as well as the creation of mountain ranges such as the Andes due to the compression of the overlying plate.