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Ignite

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    Ignite Ignite Presentation Transcript

    • Volcanoes
    • Dormant
    • Active
    • Five Classifications of Volcanoes
      • Stratovolcano
      • Cinder Cone
      • Shield Volcano
      • Caldera
      • Lava Dome
    • Stratovolcano
      • Also known as a composite cone
      • Built up from alternate layers of lava and ash
      • Form where you have ocean crust meeting
      continent crust (convergent zone).
      Example:
      Mount Fiji
    • Convergent Zone
    • Shield Volcano
      • Broad, Shallow cone
      • Layers of lava
      • Hot spots have shield volcanoes
      Example
      Hawaiian Volcanoes
    • Cinder Cone
      • Cone-shaped piles of tephra.
      • Throws out lava and ash into the air.
      • Divergent zones tend to have them in rift valleys
      ( around stratovolcanoes).
    • Divergent Zone
    • Caldera
      • Usually collapes in on a stratovolcano or a hot spot.
      • Can be up to 62 miles wide.
      • An older volcano with a large crater
    • Lava Dome
      • Forms inside a previously erupted volcano.
      • Lava domes up and cools inside an old volcano.
      Example
      Mt. St. Helens
    • What comes out of them?
    • Lava Flows
      Pahoehoe-ropey
      Aa-blocky
    • Lahar or Mud flow
    • Volcanic Ash
      Ash Fall
      Lapilli
      (little stones)
    • Volcanic Gases
    • World’s Largest Volcano
      Mauna Loa
      Erupted -
      33 times
    • World’s Smallest Volcano
      Taal
      Erupted-
      33 times
    • Volcanic Eruptions are
      Responsible for Thousands
      Of Deaths Each Year