Geography - paper 1
The Restless Earth
- 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
- Cracks - Gas and Ash erupt from chamber
- Shield Volcanoes
- 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
- Crustal rock breaks at focus
- Preparations
- Hazard Maps
- Emergency Plans - e.g. Stockpiling
- Drills
- Resistant Buildings
- Steel Cross-bracing
- Counterweights
- Sprinklers
- Deep Foundations
- Rubber Blocks
- Process
- Tsunamis
- One Plate slides under another
- Seabed lifted, water displaces and forms a wave
- In the ocean - small ripples - further out waves gain energy
- Seabed lifted, water displaces and forms a wave
- One Plate slides under another
- Fold Mountains + Ocean Trenches
- Fold Mountains: Destructive
- Anticlines and synclines formed
- Sediment settles in geosynclines
- Ocean Trenches
- Fold Mountains: Destructive
- Volcanoes
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