The mid Atlantic ridge.
Underwater mountains that rise above the surface of the water are called islands. These formations are the result of volcanic activity or tectonic movements that cause them to breach the water's surface.
Parallel belts of folded mountains and volcanic mountains
The Mid Atlantic-Rift is the name for the region of volcanic activity in the Atlantic ocean.
Mountains on the ocean floor that rise above sea level and form volcanic islands are called seamounts. These seamounts are formed by volcanic activity and can eventually emerge from the water to become volcanic islands.
chile
Seamounts are isolated volcanic mountains scatteredacross the ocean floor
volcanic mountains not formed on mid-ocean ridge
Coastal Plain
The Highlands of Scotland and the Atlantic Ocean.
The ocean floor does have underwater mountains called seamounts and undersea valleys known as trenches. These features are created by tectonic plate movements and volcanic activity on the ocean floor.
It is called the Pampas.
more volcanic activity