Geography C1 Restless Earth 

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  • Geography C1 Restless Earth
    • There are three divisions of the Earth
      • Core
        • Intensely hot
        • Largest of the 3
      • Mantle
        • Inbetween Core & Crust
      • Crust
        • Very Thin
    • Types of crust
      • Continental crust
        • Makes up most of the land area of the Earth. It is dominated by rocks such as granite
      • Oceanic crust
        • Much thinner
        • Made up of rocks such as basalt
    • How Earth's tectonic plates move
      • High temperatures in the core create rising limbs of material in the mantle called convection currents
    • Different types of plate boundary
      • Constructive
        • Formed by rising magma splitting up continental crust and forming new oceans
        • The Eurasian Plate is separating slowly from the North American plate
      • Destructive
        • Oceanic plates collide with continental plates
        • As an oceanic plate is subducted into the mantle it is subjected to increase pressure and temperature
          • This is known as subduction
      • Conservative
        • Where plates slide past each other
    • Different hazards and their causes
      • The impact of any hazard depends on:
        • The size of the event
        • The vulnerability of the population
          • Poverty increase vulnerability
        • How prepared people are for it
    • The impact of earthquakes
      • The magnitude on the Richter scale
      • The depth (Shallow earthquakes are more destructive)
      • The distance from the epicentre
      • Time of the day
      • How prepared the place is
      • The quality of emergency services
      • Primary impacts
        • The immediate effect of an earthquake on property and people
      • Secondary impacts
        • The impact on property and people of an event after it has finished. For example: Lack of shelter and basic supplies
    • Living with Volcanoes
      • Active, Dormant or Extinct
      • Primary & Secondary impacts
        • Social & Economic
    • Prediction, warning & evacuation
      • Gas emissions and 'bulging' of a volcano
      • Tsunami warning sirens
      • Emergency plans in place
    • In the developed world more money is available to make new buildings safer
    • Haiti & New Zealand

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