Fosa

The video explains the concept of subduction boundaries where one tectonic plate sinks under another, forming long and deep ocean trenches. These trenches are often parallel to volcanic island arcs. The deepest known parts of the ocean are trenches, such as the Challenger Abyss in the Marianas Trench, which is 11,000 meters deep.

What are the deepest parts of the ocean known as?

How deep is the Challenger Abyss and where is it located?