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Ricky ppt
 

Ricky ppt

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  • Volcanic Gases:-present day: 50%-80% water vapor< amounts of CO2, Nitrogen, Sulfur gases.Lava Flows:-Panahoe-taffy-like flow-AA- rough, angular block and fragments-Pillow Lava-bubble-like mass, formed when lava chills rapidly.Pyroclastic Materials:-volcanic ash-very toxic
  • Cinder Cones-rarelyexcede 400 m high-made from the toxic pyroclastic materialShield Volcanoes-built from the overlapping mineral lava flows
  • Composite-composed of lava flows and pyroclastic layers-typically mudflows
  • Gas:-very toxic, CO2Volcanic Tremors:-ground motion that last for days to months, causing magma to move beneath the surfaceForecast?-Some larger, more dangerous volcanoes are monitered-United States Geological Survey(USGS) have found several ways to help with the planning of volcanoes.

Ricky ppt Ricky ppt Presentation Transcript

  • Earth’s Hot Spots
    Volcanoes
  • A naturally occurring process
    Magma rises to the surface
    At the surface, Lava and/or Pyroclastic Flow
    What is Volcanism?
  • Volcanic Gases
    Lava Flows
    Pyroclastic Materials
    Comp
    Contents of a Volcano
  • Cinder Cones
    Small, steep-sided
    Pyroclastic material
    Shield Volcano
    Dome-shaped
    Built up from lava flow
    Types of Volcanoes
  • Composite Volcano
    Lava Domes
  • Dangerous gases
    Volcanic Tremors
    Forecasting volcanoes?
    Dangers of Volcanoes
  • Distribution of Volcanoes
  • Circum-Pacific belt
    Mediterranean belt
    Cascade range