It could be called a trench, crevice, ocean ridge, or abyss.
It's often called a trench.
A valley that is underwater.
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.
It is known as a trench, which is the lower part of the ocean. The deepest trench is the Marina Trench.
A valley that is underwater.
It is The Marianas trench it is the deepest underwater canyon and i believe the longest at 1580 miles.The mid atlantic ridge stretches 10,000 miles!
They are created in a process known as, subduction.
You are probably looking for "trench".
It is known as a trench, which is the lower part of the ocean. The deepest trench is the Marina Trench.
The river had carved a wide canyon through the relatively softer sedimentary rock. Cell phones rely on a direct line of sight, and may not work in a mountain canyon.
An underwater bubble blower.
winter in the grand canyon