The six greatest tectonic plates in the worlds mostly divide the line:
Pacific Ocean tectonic plate:About 4/5 Pacific Oceans all in this tectonic plate;
American tectonic plate:The part of Pacific Oceans,Atlantic Ocean of the whole American and close America;
Second Europe tectonic plate:Almost whole Asia and Europe,but belong to India in Asia is not in this tectonic plate,also have one part of Atlantic Ocean;
Antarctica tectonic plate:The whole Antarctica and in addition to the edge part of three oceans out of the arctic ocean;
African tectonic plate:The whole Africa and one part of Atlantic Ocean;
Indian Ocean tectonic plate:Part of Oceanica nations of Australia east,north,south,overwhelming majority Indian Ocean,and India time big six,Arabian Peninsula and all in this tectonic plate.
So,Atlantic Ocean is to be exist in alone inside a certain tectonic plate and it was "divide"ed by a few tectonic plates.It only Pacific Ocean and more and completely and alone is exist in inside a tectonic plate.Complement once,the arctic ocean was also"divide"ed by the second Europe tectonic plate,American tectonic plate.