Question

What are some of the main mid-ocean ridges on earth?

Answer 1

The main ocean ridges on Earth in near enough order of size below.

Explanation:

The Mid-Atlantic Ridge -which is the longest range of (undersea) mountains on Earth.
The Central Indian Ridge, South West Indian Ridge and South East Indian Ridge.
Pacific Antarctic Ridge.
East-Pacific Rise.
Chile Ridge.
AND Juan de Fuca Ridge (which is off of the coast in North West USA).