From Continental Drift to Plate Tectonics continental drift theory

Jun 30th, 2015
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—The hypothesis developed in the early 20th century that states that the continents move about on the surface.• which dared to challenge the long-held assumption that the continents and ocean basins had fixed geographic positions.single supercontinent consisting of all Earth’s landmasses once existed. He named this giant landmass Pangaea

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From Continental Drift to Plate Tectonicscontinental drift theory-The hypothesis developed in the early 20th century that states that the continents move about on the surface.which dared to challenge the long-held assumption that the continents and ocean basins had fixed geographic positions.single supercontinent consisting of all Earth's landmasses once existed. He named this giant landmass Pangaea (pronounced Pan-jee-ah; meaning "all lands") Wegener further hypothesized that about 200 million years ago, during the early part of the Mesozoic era, this supercontinent began to fragment into smaller landmasses. These continental blocks then "drifted" to their present positions over a span of millions of years. The inspiration for continental drift is believed to have come to Wegener when he observed the breakup of sea ice during a Danish-led expedition.Theory on sea floor spreading (hess-dietz hypothesis 1961)Continent do not cut through the earths mantle as a ship cuts through the ocean. Continents ride gently on the tops of the conveyor belts.Plate Tectonics (1965) earths crust is strong fairly rigid to the depth of 100km and plates are compose of continental and oceanic crust.Plate tectonics is the unifying theory of geology.By 1968, these developments, among others, led to the unfolding of a far more encompassing theory than continental drift, known as plate tectonics. According to the plate tectonics model, the uppermost mantle and the overlying crust be

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