Mountains inside Ocean

1.Ocean Sea mounts
2. Mid Ocean Ridge: A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. 

 A mid-ocean ridge

3. Mid Atlantic Ridge: The Mid-Atlantic Ridge (MAR) is a mid-ocean ridge, a divergent tectonic plate boundary located along the floor of the Atlantic Ocean. 

4. South Western Indian Ridge

5. Central Indian Ridge

6. South East Indian Ridge

7. Pacific Antarctic Ridge

8. East Pacific Ridge

9. 90 East Ridge