OCEA 2000X Lecture Notes - Lecture 7: Plate Tectonics, Seafloor Spreading, Continental Drift
25 Sep 2018
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Document Summary
Theory of plate tectonics: the theory of plate tectonics constitutes our most recent scientific revolution, broadens on the topic of continental drift to include explanations for the major landforms on earth. (continental drift seafloor spreading plate tectonics. The lithosphere: the earth"s rigid out layer is divided into lithospheric plates, the lithosphere rides on convective currents in the plastic, partially molten asthenosphere, earthquakes are concentrated along the boundaries of the plates. Continental margins: continental margins and plate boundaries do not always coincide, passive continental margins do not lie on a plate boundary, active continental margins lie on a plate boundary. Seafloor spreading: offset landforms can be used to determine the direction of motion. Divergent plate boundaries: plates move away from each other, rift filled with upwelling magma, eg, mid-ocean ridges, rift valleys, linear seas, at the afar triple junction, 3 divergent plate boundaries meet.
