The Mid-Ocean Ridge is a divergent plate boundary, meaning it is where two tectonic plates are moving apart from each other.

It's important to note that the Mid-Ocean Ridge is a global system of underwater mountains, so there are many pairs of plates separated by it.

Here are a few examples:

* North American Plate and Eurasian Plate (in the North Atlantic)

* South American Plate and African Plate (in the South Atlantic)

* Pacific Plate and Nazca Plate (in the Eastern Pacific)

So, to answer your question directly, you need to specify which section of the Mid-Ocean Ridge you are interested in.