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Over millions of years, the Mid-Atlantic Ridge has formed rift valleys as wide as 15 kilometers (9 miles).In the Pacific Ocean, the East Pacific Rise has created rift valleys where the Pacific plate is separating from the North American plate, Cocos plate, Nazca plate, and Antarctic plate. Many of Earth’s deepest rift valleys are found underwater, dividing long mountain ranges called s. Like many underwater rift valleys, the East Pacific Rise is dotted with vents. Valley between the mountains. As tectonic plates move away from one another at mid-ocean ridges, rock from the mantle may and harden as it contacts the sea, forming new at the bottom of the rift valley.In the northern Mid-Atlantic Ridge, the North American plate and the Eurasian plate are splitting apart at a rate of about 2.5 centimeters (1 inch) per year.