MEDC Volcano: Mt St Helens

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1. What made it happen in terms of tectonics?

  • Juan De Fuca Plate moved eastwards towards the North American plate (destructive pate margin)
  • Eurasion plate colliding with the Australasian plate (collision plate margin)
  • North American plate subducting under the African plate (destructive plate margin)
  • Arabian plate moving away from the Eurasian plate (constructive plate margin)
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2. How much ash fell?

  • 12cm
  • 15cm
  • 20cm
  • 17cm

3. What was the size of the crater created after the explosion?

  • 1 mile by 500m
  • 1 mile by 1 mile
  • 500m by 500m
  • 367m by 1.9 mile

4. How many extra masks were sent in aid?

  • 3.6 million
  • 2 million
  • 3 million

5. What is a positive effect of the ash errupted?

  • Nothing
  • Improve the quality of the soil
  • Increases the growth rate of trees
  • Cleans the roads
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