What is the name of the mid-ocean ridge that extends the entire length of the atlantic ocean?

ANSWER:

Mid-Atlantic Ridge or MAR is the mid-ocean ridge which extends the 'entire length' of the 'Atlantic Ocean'.

EXPLANATION:

This ridge is a 'divergent tectonic plate' and part of 'the longest mountain range' of the world. The ridge separates the North American plates and Eurasian in North Atlantic and in the 'South Atlantic', it separates the 'South American and African plates'. The ridge sits atop of 'Mid Atlantic Rise' which is a geological feature which runs the 'length of the Atlantic Ocean'.