Tharp’s map provided some of the necessary missing evidence. If the ocean floor was spreading apart at the Mid-Atlantic Ridge ...

At a depth of about 459 ft, the continental shelves reveal themselves, a little deeper, that is about 6,562 - 9,842 ft below ...

as shown on the map. These zones include: the Pacific Ring of Fire around the Pacific Ocean the Mid-Atlantic Ridge, a mid-ocean ridge that extends along the floor of the Atlantic Ocean southern ...