2. Natural Hazards A Natural Hazard is a natural event which is perceived by people as a threat to life and property. It may be generated from within the Earth (earthquakes, volcanoes), occur upon the surface (landslides, avalanches, floods), or happen within the atmosphere (high winds, drought, snow, fog).
3. Plate Tectonics San Francisco Large earthquakes. Conservative Himilayas Fold mountains, earthquakes. Collision Japan Subduction zone, ocean trenches, island arcs, volcanoes and earthquakes. Destructive Mid-Atlantic Ridge Continuous small volcanoes. Earthquakes. Constructive Location Effects/ Landforms Diagram
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8. Tropical Storms. Seas must be over 27 º c Water is needed to give the storm energy. Rapid uplift of air Faster winds in the centre. Lower pressure in the centre.
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10. River Floods Causes: Heavy rainfall Saturated ground Snowmelt Deposition of silt Dam failure Deforestation Urbanisation Prevention: Levees Improved services Re-afforestation Flood Action Plan Aid