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Lecture 6: How the Earth Works Terminology tectonic plate, oceanic crust, continental crust, continent, plate tectonics, plate boundary, divergent boundary, mid-ocean ridge, continental rift, rift valley, rift volcano, rift range or rift mountain, island arc, subduction, magma, volcano, collision zone, orogenic belt, volcanic arc, accretionary wedge, forearc basin, terrigenous/terrestrial sediment, subduction trench, magmatic arc, mountain chain, flux melting, transform boundary, left-lateral, right-lateral, passive continental margin, active continental margin, continental shelf, ocean basin, convection current hypothesis,volcanic bulge, narrow seaway, slab pull, ridge push, seismic tomography Dates: none Numbers: none Geography: Be able to provide a real-world geographic example for each type of plate boundary Review Questions: The boundary between crust and mantle is defined by a change in rock type, how do we recognize the boundary between the lithospheric and asthenospheric mantle? Provide the name of a plate that carries only oceanic crust What are the 6 different types of plate boundaries? Provide an actual geographic example for each of these boundaries What two plates laterally “transform relative to one another” along the west coast of California? Explain how you can tell the difference between left-lateral and right-lateral motion. How was Arthur Holmes’ convection current hypothesis wrong? Explain and discuss the major forces responsible for plate motion? What happens to subducted slabs?