Question

which place consists of deep valleys surrounded by steep undersea mountains?

an atoll
a continental margin
a mid - ocean ridge
a submarine canyon

Explanation:

• An atoll is a ring - shaped coral reef, island, or series of islets.
• A continental margin is the edge of a continent that lies under the ocean.
• A mid - ocean ridge is an underwater mountain range formed by plate tectonics. It has deep valleys (rift valleys) surrounded by steep undersea mountains.
• A submarine canyon is a steep - sided valley cut into the seabed.

Answer:

C. a mid - ocean ridge