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26 Αυγ 2015 · By combining the sea floor spreading theory with continental drift and information on global seismicity, the new theory of Plate Tectonics became a coherent theory to explain crustal movements. Plates are composed of lithosphere, about 100 km thick, that "float" on the ductile asthenosphere.
The ideas of continental drift and seafloor spreading were tied together in the theory of plate tectonics. Main points of the theory include: Earth’s outer layer is divided into lithospheric plates. Earth’s plates “float” on the asthenosphere.
Floor spreading, drift, and paleomagnetism; reconstruction of continental blocks; the hypothesis of rigid plates; kinematic considerations and the first applications of the plate hypothesis; the synthesis of Le Pichon; ancient
The concepts of continental drift and seafloor spreading are united into a more encompassing theory known as plate tectonics. This far reaching theory has become the basis for viewing most geologic processes — mountain building, paleontology, volcanism, earthquakes, etc. USGS.
• Seafloor spreading proposed that rising magma was forming new oceanic crust along the oceanic ridges and that old crust was destroyed at oceanic trenches. • The concept of seafloor spreading was combined with the earlier idea of continental drift to create the theory of plate tectonics. Scientists gradually amassed additional data that would
Students create models which show the formation of new oceanic crust through seafloor spreading and its destruction in subduction zones. They incorporate the concept of magnetic polarity reversal evident in the seafloor, one of many important pieces of evidence supporting the theory of plate tectonics.
The theory of plate tectonics originated in the late 1960’s by combining two pre-existing theories: Continental Drift – The idea that continents. move freely over the Earth’s surface, changing their positions relative to one another. Sea-Floor Spreading – A hypothesis that the.
