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MOUNT ST HELENS, A VOLCANIC ERUPTION IN AN MEDC (More Economically Developed Country)

MOUNT ST HELENS, A VOLCANIC ERUPTION IN AN MEDC (More Economically Developed Country). Where is Mount St Helens?. Mount St Helens is a volcano in north west USA. Mt St. Helens. It is in the Cascade Mountains which are FOLD mountains. The Cascades. Mt St Helens – causes of the eruption.

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MOUNT ST HELENS, A VOLCANIC ERUPTION IN AN MEDC (More Economically Developed Country)

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  1. MOUNT ST HELENS, A VOLCANIC ERUPTION IN AN MEDC (More Economically Developed Country)

  2. Where is Mount St Helens? • Mount St Helens is a volcano in north west USA. Mt St. Helens • It is in the Cascade Mountains which are FOLD mountains The Cascades

  3. Mt St Helens – causes of the eruption North American Plate Juan de Fuca

  4. Mt St Helen’s eruption (May 1980) Mt St Helens Located in the USA NORTH AMERICAN PLATE JUAN DE FUCA PLATE DESTRUCTIVE PLATE BOUNDARY Internet Links http://volcano.und.nodak.edu/vwdocs/msh/msh.html

  5. Mt St Helens – causes of the eruption North American plate Juan de Fuca plate Mt St Helens is located on a destructive plate boundary where a continental plate (North American) meets an oceanic plate (Juan de Fuca). Which plate is denser? Describe what happens when the oceanic plate descends under the continental plate.

  6. Mt St Helens – the eruption

  7. WATCH VIDEO CLIP OF MOUNT ST HELENS ON FROG WEBSITE

  8. BEFORE

  9. AFTER

  10. MOUNT ST HELENS, USA JUAN DE FUCA AND NORTH AMERICAN PLATE DESTRUCTIVE

  11. Mt St Helens – consequences of the eruption N 0 10km

  12. What damage did the eruption cause? Short term Or long term? Up to 70mm of ash falls across Washington … 7000 school students have an early summer vacation due to problems on the roads Mudflows block and divert rivers. The US army takes 18 months to dig out the debris from the River Toutle. A decrease in tourism Communications routes threatened – railway and road bridges destroyed, Portland harbour blocked Hot mudflows raise the temperature of the rivers and lakes to 30ºC 60 people die from the eruption. Two million birds, animals and fish are killed. Damage to crops=$175million The post office and Lone Fir Motel shut down in Cougar.

  13. Why do people live in volcanic areas? ADVANTAGES: This lava is weathered (broken down) to form a fertile soil, Geothermal energy (heat from the earth) can be produced in many volcanic areas. Tourists are attracted to areas of volcanic activity. Minerals eg sulphur

  14. Why do people live in volcanic areas? DISADVANTAGES: • Explosions and eruptions cause: • Dangerous gases 2. Loss of life 3. Loss of homes, animals, wildlife, trees and crops 4. Disease and fires 5. Avalanches, mudflows and floods

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