Tectonics

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  • Tectonics
    • Earths Structure
      • The Crust
        • A layer of solid rock 5-90km thick
        • Oceanic
          • 200 m years old
          • Thinner, more dense
          • Can be destroyed
        • Continental
          • Billions years old
          • Thicker, less dense
          • Cannot be destroyed
        • Outer layer of Earth
      • Mantle
        • Semi solid molten rock
          • Magma
        • Can reach 5000 centigrade
        • Surrounds core
      • Core
        • Inner
          • Solid ball of nickel and iron
          • As hot as the sun
        • Outer
          • Liquid iron
          • 5000 degrees
          • Pressure makes it solid
    • Plate margins
      • Destructive
        • Oceanic and Continental move towards each other
        • Oceanic is destroyed as it sinks below continental
        • Volcanoes and mountains produced
      • Constructive
        • Two plates move apart
        • Magma rises
        • Causes volcanoes
      • Collision
        • Two continental pushed together
        • Cant destroy each other so fold up
        • Create mountains and earthquakes
      • Conservative
        • Plates moving past each other
          • Different speeds, same or opposite direction
        • Not smooth, pressure builds
        • When it lurches pressure breaks
          • Causes earthquakes
    • Plate Movement
      • Convection Current
        • 1. Core heats mantle
          • 2. As the heat rises it is pushed sideways as it cant get through the crust
            • Convection Current
              • 1. Core heats mantle
                • 2. As the heat rises it is pushed sideways as it cant get through the crust
                  • 3. When it cools the hot air drops
                    • This is a constant cycle
                      • Causes movment
            • 3. When it cools the hot air drops
              • This is a constant cycle
                • Causes movment
      • Continental Drift
        • Continents fit together like a puzzle
        • Similar fossils have been found on other sides of world
          • The animals cant swim or fly
        • Rock types are also similar around the world
    • Hazards
      • Volcanoes
        • Found at destructive and constructive
        • When a plate is destroyed it turns to magma
          • This magma rises
        • The magma then erupts
          • This is a volcano
        • Magma is called lava on the surface
      • Earthquakes
        • Found at all boundaries
        • Caused by the tension being released
          • This sends up shockwaves
        • Measured in magnitude
        • Epicentre is above focus
        • Stronger at focus

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