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trench
yes, the mid ocean ridges are a steep sided valley at the center of a mid ocean ridge
Submarine Canyons
are the tops of some mid-ocean ridges split by a steep-sided valley
it is a caldera im learning that in science:)
dick in your mouth
A rift valley is a lowland region that forms as tectonic plates move away from each other, creating a depression. A trench, on the other hand, is a long, narrow, steep-sided depression in the ocean floor formed at a subduction zone where one tectonic plate is forced beneath another. Rift valleys occur on land, while trenches are found in the ocean.
Face Mountain
yes
This is a crater
The steep area between the continental shelf and the ocean floor is called the continental margin. A continental margin is usually composed of a steep continental slope that is followed by the flatter continental rise.
A trench.