They are both giant holes in the ground. Trenches are found underwater and valleys are found on land.
They are called trenches.
Trenches
rilles
They are narrow trenches or small, narrow valleys.
Trench. I believe they are known as trenches.
They are called oceanic trenches.
Unlike deep sea trenches which are found in areas where one tectonic plate slides beneath another undersea canyons are found along the slopes of most continental margins the submarine canyons for example tend to have steeper side slopes much higher gradients and considerably narrower floors. thats how they different
The Marianas Trench, and many other deep undersea valleys, can be found on the ocean floor.
Yes the ocean floor has mountains and deep trenches.
Trenches
It creates valleys or trenches
rift valleys