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When the earth moves

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Transcript

  • 1. When the earth moves…
    Plate tectonics
  • 2. Why do tectonic plates move?
  • 3.
  • 4. Convection currents
  • 5. Continental drift, plate movement
    http://www.youtube.com/watch?v=uGcDed4xVD4
  • 6. Key Terms
    Fault: A fracture in the Earth’s crust that shows signs of movement
    Continental drift: the movement of the continents over time through plate tectonics
    Subduction Zone: the area of a destructive plate boundary where one plate descends beneath another
    Convergent (aka destructive): where plates collide together, forcing one plate downwards to form either volcanoes or mountains or trenches
    Divergent(aka constructive): where plates are moving apart, allowing magma from the mantle to reach the earth’s surface + create new land
    Transform: where plates slide past each other, causing lots of earthquakes
    Continental Crust: lighter, permanent land that forms our continents
    Oceanic Crust: denser crust under the oceans, constantly recycled
  • 7. Tectonics enquiry…you have 30mins
    Plate tectonics
    Plate tectonics
    on a flip camera
    • Use the textbooks to investigate plate tectonics : how the earth moves, why & how it creates earthquakes and volcanoes.
    • 8. Include keywords (e.g. continental drift, subduction, convergent, divergent, transform, convection, etc.)
  • Exam Q
    Describe, with the aid of a diagram, the processes that causes tectonic plates to move
    [4 marks]

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