![]() ![]() These rifts are about 20 miles wide (30 km) and 6,500 feet (2,900 m) deep and are a site where lava is expelled on to the ocean floor. At the crest of the ridge system lies a trough or rift. Known for over a century, the mid-ocean ridge system in the Atlantic Ocean rises some 6,500 feet above the surrounding ocean floor and extends for more that 37,500 miles (60,000 km) in all the world's oceans. During the 1950's seismologists showed that earthquake activity was concentrated along the longest continuous mountain system on Earth, the mid-ocean ridge. In the late 1950's and early 1960's oceanographic research was opening the final frontier on Earth, the mysteries of the ocean floor. \): Mid-ocean Ridge (Courtesy USGS) (Click image to enlarge) When the Earth falls apart, history's greatest heroes will keep it together.Tagline Ice Age: Continental Drift (also called Ice Age 4: Continental Drift or simply known as Ice Age 4) is an American 2012 computer-animated comedy adventure film, the fourth installment in the Ice Age franchise, and the sequel to the 2009 film Ice Age: Dawn of the Dinosaurs.
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