What is a mid-ocean ridge.

A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.

A mid ocean ridge is a divergent boundary between the North-American and Eurasian plates. It extends for a long time and causes a rift valley to form. We can see the seafloor spreading from mid-ocean ridges. It is located in the Atlantic and Pacific ocean.