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Geo - Unit 3 Cont. - Evolution of continents(cont'd once...

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3-31-07 Evolution of continents (cont’d)- once formed, stay around cratons (shield and platform) mountain belts, suture zones, displaced terranes, continental positions through time (paleomagnetism) Rates of plate motion Driving forces ultimately- heat transfer from the earth’s interior (convection) proximate mechanisms ridge push/plate sliding slab pull mantle convection- drag Intro to Mass Movement driving force (gravity) and resisting force (friction) angle of repose Exam on Friday Will 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 - landslides Craton - relatively stable, ancient centers of continents Shield - areas where the ancient continental crust is exposed Platform - areas where the ancient continental crust is buried under younger, relatively unreformed sedimentary rocks Shield : area of exposed Precambrian rocks Platform : area of Precambrian rocks covered by sedimentary rocks
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