R Lesson 2 Revision - Locations and Risk: Tectonic Movement

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  • Tectonic Movement
    • Crusts
      • Thin oceanic crust composed of mainly basalt.
      • Thicker continental crust composed mainly of granite.
    • Rocks in Mantle
      • Upper mantle rock is brittle enough to break under stress - earthquakes.
      • Lower mantle rock is plastic and flows when subjected to forces, instead of breaking.
    • Convection Currents
      • Heat derived from the core rises in mantle to drive convection currents - moves tectonic plates.
    • Sea Floor Spreading
      • Divergent boundaries under ocean
      • Continuous input of magma forming 'mid-ocean ridges'
      • MID-ATLANTIC RIDGE
      • On land - 'rift Valleys' form
    • Methods of movement
      • Convection Currents
      • Slab Pull
    • Benioff Zone
      • Intermediate/deep focus
      • A zone in which many deep earthquakes occur
      • Situated beneath a destructive boundary where oceanic crust is subducting

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