Geography - paper 1

The Restless Earth

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  • Created by: Hgilbert
  • Created on: 12-05-14 20:08
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  • The Restless Earth
    • Volcanoes
      • Shield Volcanoes
        • Constructive Plate Boundaries
        • Basic Lava (1200 c)
        • Coned Shape - gentle slope
      • Composite Volcanoes
        • Destructive Plate Boundaries
        • Acid lava (800 c)
        • Coned Shape - Steep Sides
        • Secondary Vent
      • Supervolcanoes
        • Above Hotspots
        • Vast Calderas
        • Subsidence causes crater lakes
        • Bulge - Magma cannot escape
          • Cracks - Gas and Ash erupt from chamber
            • Caldera - magma collapses
    • Earthquakes
      • Process
        • Occur at/close to plate boundaries
        • Plates locked by friction - pressure builds
          • Crustal rock breaks at focus
            • Stored energy released as seismicwaves outward from epicentre
      • Preparations
        • Hazard Maps
        • Emergency Plans - e.g. Stockpiling
        • Drills
      • Resistant Buildings
        • Steel Cross-bracing
        • Counterweights
        • Sprinklers
        • Deep Foundations
        • Rubber Blocks
    • Tsunamis
      • One Plate slides under another
        • Seabed lifted, water displaces and forms a wave
          • In the ocean - small ripples - further out waves gain energy
    • Fold Mountains + Ocean Trenches
      • Fold Mountains: Destructive
        • Anticlines and synclines formed
        • Sediment settles in geosynclines
      • Ocean Trenches

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