13 - Plate Tectonic Theory

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13 - Plate Tectonic Theory

  1. 1. What do these maps show?
  2. 4. Task Produce an annotated world map to show the location and distribution of earthquakes, volcanoes and fold mountains Use pages 8+9 from the Atlas You have 15 minutes
  3. 5. Structure <ul><li>You should be able to </li></ul><ul><li>Describe the general distribution of fold mountains, volcanoes and earthquakes </li></ul><ul><li>Explain how this distribution is related to movements at plate boundaries. </li></ul><ul><li>Understand the processes leading to the formation of rift valleys and block mountains. </li></ul><ul><li>Show a basic understanding of plate tectonics, describing the global pattern of plates, their structure, and be aware of plate movements - plates moving away from each other (sea floor spreading), plates moving towards each other (subduction) and plates sliding past each other. </li></ul>
  4. 6. The Structure of the Earth
  5. 8. Crustal Plates
  6. 9. Types of Crust <ul><li>Oceanic crust that lies under the ocean, is mainly basalt and 5-7km thick </li></ul><ul><li>Continental crust 20-50km thick and composed mainly of granite; it makes up the large land masses – the continents </li></ul><ul><li>Continental crust is low density and “floats” on top of the mantle whereas oceanic crust is much higher density </li></ul>
  7. 10. Convection Currents
  8. 11. Destructive (Convergent) Plate Boundary (Margin) subduction
  9. 12. Constructive (Divergent) Plate Boundary (Margin) Sea floor spreading
  10. 13. Cross section of the Atlantic
  11. 14. Other Plate Boundaries - Collision India colliding with Asian subcontinent
  12. 15. Other Plate Boundaries - Conservative San Andreas fault California
  13. 16. Rift Valley and Block Mountains
  14. 18. The end result
  15. 19. But is it all bad?
  16. 20. Task <ul><li>Produce an A3 summary sheet to show the 4 plate boundaries (destructive, constructive, collision and conservative) </li></ul><ul><li>You need a cross-sectional diagram of each </li></ul><ul><li>For each boundary you should; </li></ul><ul><li>describe what is happening, </li></ul><ul><li>give a real example of a place in the world where this boundary can be found, </li></ul><ul><li>outline the type of tectonic (volcanic and earthquake) activity linked with each boundary. </li></ul>

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