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Transcript
Introduction to Plate Tectonics California Geology 20 Lithosphere: outer layer of the earth that includes both continental and ocean crust, the Moho and the upper rigid portion of the mantle. “rigid sphere” sphere” Asthenosphere: Asthenosphere: A dense portion of the mantle of unknown thickness that supports the lithosphere and possibly undergoes convection. “weak sphere” sphere” Theory: A comprehensive explanation of a given set of data that has been repeatedly confirmed by observation and experimentation and has gained acceptance within the scientific community but has not yet been decisively proven. Or…… .. Or…….. a wellwell-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena. Plate Tectonics: a process of global dynamics where the outer layers of the earth (the lithosphere) are divided or “broken” broken” into several large pieces and numerous small ones that move in response to convection in the mantle. Plate Tectonics: a process that accounts for geologic activity such as earthquakes, volcanoes and mountain building to occur in relatively narrow zones as a result of the interaction of lithospheric plates. Divergent Margins Formation of ocean Lithosphere Deep Sea Trenches Convergent Margins Oceanic – Continental Convergence Oceanic – Oceanic Convergence Convergent Collision Continental – Continental Convergence Obduction and Ophiolites Can you name the layers? Transform Margins aka Transcurrent end