Restless Earth

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  • Created by: Olliejh98
  • Created on: 25-01-15 15:26
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  • The Restless Earth
    • The Earths Crusts
      • Continental
        • Older (1500 million yrs old), Thicker (30km), Granite, Can't be renewed/ destroyed
      • Oceanic
        • Younger (under 200 million yrs old), Thinner (5-10km) , Basalt, Can be renewed/ destroyed
    • Plate boundaries
      • Destructive
        • Collision
          • Africa/Eurasia (Cont+Cont.)
        • Subduction
          • South America/Nazca (Oceanic+Cont.)
      • Constructive
        • Plates diverge
          • Pacific/Nazca
      • Conservative
        • Plates slide alongside at different speeds
    • Landforms/ Occurences
      • Destructive
        • Subduction
          • Ocean trench/ Composite Volcanoes/ Earthquakes
        • Collision
          • Fold mountains
      • Constructive
        • Mid-ocean ridge/ Shield Volcano/ mild Eathquakes
      • Conservative
        • Earthquakes
    • Volcanoes
      • Composite
        • Infrequent but violent eruptions
          • Steep slopes, narrow base, crater and secondary vents
            • Viscous lava/ pyroclastic flow 400 degrees
      • Shield
        • Frequent non violent eruptions
          • Wide base, gentle slopes, crater
            • Thin/ runny lava
      • Supervolcano
        • Dormant with potentially catastrophic consequences
          • Huge caldera (depression in land) vastly bigger than standard volcanoes
            • Emit at least 1000km cubed of material, gas and ash erupt from cracks in the surface
    • Earthquakes
      • Monitoring
        • Seismogram
      • Features
        • Focus- point of origin
        • Epicentre- directly above on surface
        • Seismic waves- radiate out from focus
          • Once the surface is reached: Primary-longitudal             Secondary- latitudal
      • P.P.P
        • Preparation
          • Hospitals
          • Education/ Drills
        • Protection
          • Interlocking steel frame
          • Computer controlled weights on roof
          • Foundations and rubber shock absorbers
        • Prediction
          • Animal behaviour
          • Foreshocks (not long enough to evacuate)
          • Technology
    • Tsunamis
      • Triggered by Earthquakes
        • Primary effect- shifting of crust
          • Secondary effect- displacement of water
            • Crests initially about 220km apart, when land is reached wavelength shortens and height increases
              • The wave originally travelling at about 800kph slows down as it reaches shallow water

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