Earth Science 6.2 : Effects of Volcanic Eruptions
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Earth Science 6.2 : Effects of Volcanic Eruptions

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Earth Science 6.2 : Effects of Volcanic Eruptions Earth Science 6.2 : Effects of Volcanic Eruptions Presentation Transcript

  • Earth Science : 6.2
    Effects of Volcanic Eruptions
  • Objectives:
    Explain how volcanic eruptions can affect climate.
    Compare the three types of volcanoes.
    Compare craters, calderas, and lava plateaus.
  • Volcanic Eruptions and Climate Change
    During a large-scale volcanic eruption,
    Enormous amounts of volcanic ash and gases are ejected into the upper atmosphere.
    As volcanic ash and gases spread throughout the atmosphere, they can block enough sunlight to cause global temperature to drop.
  • Different Types of Volcanoes
    Volcanic eruptions can cause profound changes in climate,
    But the changes to the Earth’s surface are more familiar.
    Perhaps the best known of all volcanic landforms are the volcanoes themselves.
    There are three basic types of volcanoes:
    Shield Volcanoes
    Cinder Cone Volcanoes
    Composite Volcanoes
    Mauna Loa, in Hawaii – World’s Largest volcano
  • Shield volcanoes
    Built of layers of lava that are released from repeated nonexplosive eruptions.
    The lava spreads out over a wide area, creating a volcano with gently sloping sides.
    Belknap shield volcano, Oregon
    Erta Ale, Ethiopia
  • Cinder cone volcanoes
    Made of pyroclastic material usually produced from moderately explosive eruptions.
    The pyroclastic material forms steep slopes.
    Northern Arizona
  • Composite volcanoes
    Formed from explosive eruptions of pyroclastic material, followed by quieter flows of lava.
    These formations, among the most common types of volcanoes, have broad bases and sides that get steeper toward the top.
    Mt. Rainier, Washington State
    Mt. Fuji, Japan
  • Other Types of Volcanic Landforms
    In addition to volcanoes, there are other landforms produced by volcanic activity.
    Craters
    Funnel-shaped pits near the top of the central vent of a volcano.
  • Calderas
    Large, semicircular depressions that form when the magma chamber below a volcano partially empties and causes the ground above to sink.
    Calderas can appear similar to craters, but are many times larger.
  • Lava Plateaus
    Wide, flat landforms that result form repeated nonexplosive eruptions of lava that spread of a large area.
    The lava that formed lava plateaus usually erupted from long cracks, or rifts, in the crust over a period of millions of years.
    Columbia River Plateau