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

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  • Volcanic Gases:-present day: 50%-80% water vapor&lt; 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.
  • Transcript of "Ricky ppt"

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