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Unformatted text preview: 3-31-07Evolution of continents (cont’d)- once formed, stay aroundcratons (shield and platform)mountain belts, suture zones, displaced terranes, continental positions through time (paleomagnetism)Rates of plate motionDriving forcesultimately- heat transfer from the earth’s interior (convection)proximate mechanismsridge push/plate slidingslab pullmantle convection- dragIntro to Mass Movementdriving force (gravity) and resisting force (friction)angle of reposeExam on FridayWill cover •the end of Chapter 10 -EQ’s (only plate tectonics, hazards and minimizing their impact)•11 - earth interior•1, 12, 13 - continental drift and plate tectonics•14 - landslidesCraton- relatively stable, ancient centers of continentsShield- areas where the ancient continental crust is exposedPlatform- areas where the ancient continental crust is buried under younger, relatively unreformed sedimentary rocksShield: area of exposed Precambrian rocksPlatform: area of Precambrian rocks covered by sedimentary rocks...
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