Which part of the ocean floor is part of the continuous underwater mountain range that circles earth?

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Your question: Which part of the ocean floor is part of the continuous underwater mountain range that circles earth?

Your  Mid- ocean ridge is the part of the continuous underwater mountain range that circles earth.

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They are mid oceanic ridges.

Explanation:

As the ocean floor is made of the pate tectonics most of the spreading of the seafloor occurs along with the divergent plate and these form ridge of mountainous ranges under the surface of the ocean and forms part of the above water volcanic and seamounts.

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