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Download Seafloor Spreading Notes Harry Hess He was a geology Professor
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Seafloor Spreading Notes Harry Hess He was a geology Professor at Princeton He was also a Navy Captain in World War 2 Used the SONAR on his ship, which was meant for finding enemy submarines, to map the Ocean Floor He discovered the Pacific Ocean floor had Mt. Ranges and Trenches Seafloor Spreading Theory After extensive research, Hess believed that the oceans spread from their centers at Mid Ocean Ridges Magma/Lava oozed up from the Earth’s mantle along the mid ocean ridges into the ocean. This created new Seafloor which then spread away from the ridge in both directions. As spreading continued, the older ocean floor cooled and sank Why Isn’t Earth Growing ? While Hess believed that as the Ocean floor was growing from the middle He also believed it was being destroyed and recycled near the Continents at Deep Ocean Trenches This process is called Subduction Mid Atlantic Ridge Worlds largest Mid Ocean Ridge Believed to be the force Wegener was looking for to explain how continents drifted apart Stretches about 12,000 miles from the Tip of Africa to the Arctic Ocean Can reach nearly 1000 miles wide Over 1 mile high in certain spots Mariana Trench The Mariana Trench lies near the Philippines in the Pacific Ocean It is a crescent-shaped scar in the Earth’s crust that measures more than 1500 miles long and 43 miles wide The distance between the surface of the ocean and the trench’s deepest point is nearly 8 miles If Mt. Everest were dropped into the Mariana Trench, its peak would still be more than a mile underwater.