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1947 maurice ewing determines the existence of a vast

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Unformatted text preview: c (later called the Mid-Atlantic Ridge) OCE 661 Chronology of recent discoveries in this area a. 1947: Maurice Ewing determines the existence of a vast abyssal plain. b. 1947: Oceanographers abandon the idea that the Oceans' floors are flat and produce arguments in favor of the continental drift hypothesis. c. 1950's: Prompted by studies of paleomagnetism in the 1940's, geologists and oceanographers begin to accept the concept of continents moving relative to magnetic poles and to one another. This change represents the beginning of sea floor spreading and plate tectonics. d. 1953 : American geologists Maurice Ewing and Bruce Heezen discover an underwater canyon , and in 1956 they propose the existence of the Mid-Oceanic Ridge, accompanied by a formation of canyons called the Great Global Rift. The discovery that the rift separates the Earth's crust into plates contributes to the development of the theory of plate tectonics. e. 1960: US Geologist Harry Hess proposes the concept of sea floor spreading, a key idea in plate tectonics. Hess suggests that new crust fo...
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