Answer:
The answer is: volcano.
Step-by-step explanation:
The mid-ocean ridges are underwater elevations located in the middle part of the Earth's oceans.
The chain has a very rugged relief, with wide slopes and ridges often marked by a deep longitudinal recess, called the sinking or rift valley, along which numerous surface earthquakes and volcanic eruptions occur that pour basalt lavas.
The answer is: volcano.