Mount St Helens

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  • Mount St Helens
    • Cause
      • Juan de Fuca plate forced under the North American Plate.
      • Destructive Plate Boundary
      • Continental and Oceanic Plates
      • Gas bulge appeared on the North side.
      • Small movement of plates triggered the eruption.
    • Effect
      • 200 houses destroyed.
      • Caused deforestation
      • 63 people killed
      • 400m of mountain blown away.
    • Response
      • Soil fertility improved
      • Tourism increased.
      • Cost $1.1 billion in total.
      • Counselling needed for post traumatic stress
      • 10 million trees replanted


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