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  • Created by: Ellie
  • Created on: 31-05-13 17:07

supervolcanoes are massive volcanoes

develop at destructive plate margins, or over hotspots eg Yellowstone National Park, USA.

Formation at hotspots:

  • magma rises through cracks in crust to form magma basin below surface. presence of magma causes bulge on surface several km wide.
  • bulge eventually cracks, creating vents for lava to escape through. lava erupts causing earthquakes, sending up gigantic plumes of ash & rock.
  • as magma basin empties, bulge no longer supported. collapses and more lava spewed out.
  • after eruption, crater (caldera) left behind where bulge erupted. sometimes filled with water to form lake…


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