GEOL 101 2:13-2:17

GEOL 101 2:13-2:17 - February 1317 WEEK#6 Global Tectonics...

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February 13-17 WEEK #6 – Global Tectonics 3: Plate Tectonics Cycle and Driving Mechanisms Lecture Objectives Be able to identify and differentiate between ridge-push and slab-pull forces. Be able to explain how tectonic boundaries evolve through time. Be able to differentiate between active and passive continental margins. I. Tectonic Boundaries Evolve Plate boundaries change over geologic time. Oceanic plates  Created at MOR spreading centers Destroyed at subduction zones. Continental plates Torn apart at rifts Joined during collision Continental Rifting Continental lithosphere can break apart. Lithosphere stretches and thins Brittle upper crust faults Ductile lower crust flows Asthenosphere melts Melts erupt, leading to… SEA-FLOOR SPREADING Example: East Africa
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The Arabian plate is rifting from the African plate. Rifting has progressed to sea-floor spreading in… THE RED SEA and THE 
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GEOL 101 2:13-2:17 - February 1317 WEEK#6 Global Tectonics...

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