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OLM Science6_8

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Grade 6, Chapter 8

Grade 6, Chapter 8

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OLM Science6_8 OLM Science6_8 Presentation Transcript

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