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OLM Science6_8

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Grade 6, Chapter 8

Grade 6, Chapter 8

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  • 1. Chapter 8 Volcanoes Volcanic Eruptions Section 1
  • 2. Nonexplosive Eruptions
    • Volcanoes with Lava flows
  • 3. Explosive Eruptions
    • Clouds of hot debris and gases shoot out from the volcanoes
  • 4. Magma
    • Hot liquid material volcanoes are created in
  • 5. Vents
    • Holes in the Earth’s crust that magma rises through
  • 6. Lava
    • Magma that erupts onto the Earth’s surface
  • 7. Pyroclastic Material
    • Magma & fragments of rock that are blasted into the air during violent earthquake eruptions
  • 8. Volcano
    • A vent or group of vents combined with a buildup of lava or pyroclastic material
  • 9. Magma - High Water Content
    • Explosive volcanoes with high water content
  • 10. Magma - Silica
    • Magma that contains a large percentage of Silica
  • 11. Blocky Lava
    • Cool stiff lava that cannot travel far from the erupting vent
  • 12. Pahoehoe
    • Lava that flows like wax dripping from a candle
  • 13. Aa
    • Lava that has a jagged surface
  • 14. Pillow Lava
    • Lava that erupts underwater
  • 15. Volcanic Blocks
    • Largest pieces of pyroclastic material
  • 16. Volcanic Bombs
    • Large blobs of magma that harden in the air
  • 17. Lapilli
    • “Little stones” pebble-like bits of pyroclastic material
  • 18. Volcanic Ash
    • Particles that are less than 2 mm in diameter
  • 19. Chapter 8 Volcanoes Volcanoes’ Effects on Earth Section 2
  • 20. Volcanic Flows
    • Clouds of hot ash that flow rapidly downhill like an avalanche
  • 21. Volcanic Fallout
    • As volcanic ash falls to the ground effects may be devastating
  • 22. Climatic Fluctuation
    • Ash & gases spread around the globe & block out the sun
  • 23. Shield Volcanoes
    • Layers of lava from repeated non explosive eruptions
  • 24. Cinder cone volcanoes
    • Small volcanic cones made entirely of pyroclastic material from moderately explosive eruptions
  • 25. Composite Volcanoes
    • Explosive eruptions of pyroclastic material
  • 26. Crater
    • Funnel shaped pit at the top of the central vent
  • 27. Caldera
    • Magma chamber volcanoes empties & roof collapses
  • 28. Chapter 8 Volcanoes What causes Volcanoes? Section 2
  • 29. Formation of Magma
    • Magma forms below the Earth’s surface in a region that includes the lower crust & the upper mantle
  • 30. Where Volcanoes Form
    • Tectonic plate boundaries form “ring of fire”
  • 31. Rift
    • Deep crake forms between the plates
  • 32. Hot Spots
    • Tectonic plates that are directly above columns of rising magma