A deep canyon in the ocean floor is called

The question is asking to state the term that is used that refers a deep canyon in the ocean floor, base on my research and further investigation, I would say that the answer would be Trench, I hope you are satisfied with my answer and feel free to ask for more if you have questions

A deep canyon in the ocean floor is called Trench.

Explanation:

The sea bottom plunges into deep under-water canyons known as deep-ocean trenches. A trench may be a form of excavation or depression within the ground that's typically deeper than it's wide and slender compared with its length.