Directly opposite the Mid-Atlantic Ridge, depressions formed. These persist today as the [[Mariannas Trench]] and especially the [[Challenger Depth]], two of the deepest places in all the earth's [[ocean]]s. | Directly opposite the Mid-Atlantic Ridge, depressions formed. These persist today as the [[Mariannas Trench]] and especially the [[Challenger Depth]], two of the deepest places in all the earth's [[ocean]]s. |