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What causes volcanoes to erupt?

  1. Apr 21, 2016 #1
    I would appreciate if you could provide a source. Thanks!
  2. jcsd
  3. Apr 21, 2016 #2


    Staff: Mentor

  4. Apr 29, 2016 #3
  5. May 5, 2016 #4


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    Staff Emeritus
    Science Advisor

    Mount St. Helens Is Recharging Its Magma Stores, Setting Off Earthquake Swarms
    Last edited: May 7, 2016
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