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VOLCANOES

VOLCANOES. Pompeii, Italy. Bodies…. Pompeii, Italy. Terms to know…. Magma- liquid rock Lava- magma that breaks through to the surface of the earth Vent- opening through which magma flows Volcano- structure formed by the vent and the volcanic material that builts

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VOLCANOES

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  1. VOLCANOES

  2. Pompeii, Italy

  3. Bodies…

  4. Pompeii, Italy

  5. Terms to know… • Magma- liquid rock • Lava- magma that breaks through to the surface of the earth • Vent- opening through which magma flows • Volcano- structure formed by the vent and the volcanic material that builts • Pyroclastic material- ash and rock material ejected from a volcano

  6. Volcanoes

  7. Where do volcanoes happen? • Subduction zones- Pacific Ring of Fire • Mid-Ocean Ridges- fissures (breaks and cracks, Iceland) • Hot Spots-not along plate boundaries- areas of volcanic activity within the plate

  8. Where?

  9. What erupts? • Lava • Mafic- oceanic, slow • Felsic- continents, fast • Gases • Rock fragments or Pyroclastic Material • Volcanic Ash • Volcanic Dust • Volcanic Bombs (hot) and Blocks (cold)

  10. 3 Types of Volcanoes • Shield Volcano • Cinder Cone • Composite Volcano

  11. Shield Volcano • Broad base • Gentle sloping sides • Covers a wide area • Lava builds up slowly to form volcano body • Quiet eruptions • Hawaiian Islands

  12. Cinder Cone • Explosive eruptions • Very steep sides (40 degrees or more) • Solid fragments (pyroclastic material) that are ejected make the volcano body • Rarely more than a few hundred meters high

  13. Composite Volcano • Both explosive and quiet eruptions • Body of volcano made of alternating layers of lava (quiet eruptions) and pyroclastic material(explosive eruptions) • Mt. St. Helens (USA) and Mt. Fuji (Japan)

  14. The Ring of Fire • Ring Of Fire IMAX movie • Other Videos • Volcano Concept Map • Plotting the Ring of Fire

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