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Journal CH 12.2 (Part 2) Volcano

Journal CH 12.2 (Part 2) Volcano. 1. VOLCANO: A mountain like feature that forms from magma coming out of it. 2. Types of Volcanoes: Composite/Strato Volcano Shield Volcanoes 3. Parts of a Volcano:. Crater or Caldera. Cone. Vent. Crust. Magma Chamber

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Journal CH 12.2 (Part 2) Volcano

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  1. Journal CH 12.2 (Part 2)Volcano

  2. 1. VOLCANO: • A mountain like feature that forms from magma coming out of it. 2. Types of Volcanoes: • Composite/Strato Volcano • Shield Volcanoes 3. Parts of a Volcano: Crater or Caldera Cone Vent Crust Magma Chamber Where magma, toxic gases, & water vapor are stored. Mantle

  3. 4. Pyroclast: • Silica rich lava 5. Lava: • Melted rock found on the surface 6. Magma: • Melted rock below the surface 7. Pyroclastic Flow: • Avalanche of silica rich lava (pyroclasts)

  4. 8. Active Volcano: • Volcano that has erupted recently 9. Dormant Volcano: • Volcano that has not erupted recently, but could still erupt 10. Extinct Volcano: • Volcano that can NEVER erupt because there is no longer any magma refueling the chamber

  5. The oceanic plate subducts, melts, and rises through the tectonic plate above it. • Water subducts with the oceanic plate causing water vapor to collect in the magma chamber (more pressure) • Important: Magma comes from the melted crust (more silica)…so sticky magma like toothpaste creating steep sides. 11. STRATO (COMPOSITE) VOLCANOES Core Ocean Oceanic Crust A Mantle Convection cells

  6. Magma may also come from the mantle. This is less likely, but does happen. This causes some eruptions to be silica poor lava (more runny or fluid lava) • Magma from the mantle is silica poor Core volcanoes Ocean Oceanic Crust A Mantle Convection cells 3, Oceanic crust A subducts & gets closer to the core where it is hot. It then melts, and the melted crust rises through the crust above it forming volcanoes.

  7. 12. Shield Volcanoes Magma comes from the mantle (less silica) • The crust moves with the convection cell to the left. 4. The volcano gets bigger as it erupts more 6. The hot spot does NOT move 7. The old volcano is extinct (cannot erupt) 3. Magma reaches the surface and comes out. A volcano forms • A new volcano forms at the hot spot Core Lithosphere Mantle 2. Plastic rock reaches the crust and melts through creating a HOT SPOT • Plastic rock rises

  8. Hot Spot • Magma comes from the mantle (less silica) • Lava is more runny so we get less steep sided volcanoes Core Lithosphere Mantle 2. Plastic rock reaches the crust and melts through creating a HOT SPOT • Plastic rock rises

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