Trenches
Continental shelf
ocan
trenches.
rift valley
An ancient under sea valley carved in the ocean floor is known as a canyon, usually given the name of the contributory river on the land. such as the Hudson Canyon, or the Clutha Canyon.
This iis a trench.Also ocean basin is the deepest part of the ocean.
an ocean valley is a valley that contains water
Yes, there is a valley in the center of the mid-ocean ridge called the rift valley. It is formed due to tectonic plates diverging and magma rising to create new oceanic crust. The rift valley is a significant feature of the mid-ocean ridge system.
the ocean-bottom
under toe
A Structure.
They are called trenches.