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Volcanoes (Parts of Volcanoes (Vent - The opening at the top of the…

- - - - Quiet - Pours out and runs down the side
        
        AA - slow, high viscocsity
        
        Pahoehoe - Fast moving, low
      - Explosive - Start with vent blocked, high vis.
      - Gases
        
        Water Vapor, Carbon Dioxide, Sulfur Oxide
      - Volcanic Ash - Tiny particles of pulverized volcanic rock and glass
      - Rocks
        
        Pumice, Obsidian
- - - - Advanced - Complex water system
      - Vulcan - God of fire
        
        Festival - August 23
        
        Bonfires Sacrificed small animals
        
        Frequent earthquakes
        
        5.6 earthquake damages much of the city
        
        Few were repaired
        
        Mount Vesuvius erupted in August
- - - - Ring of Fire
      - Mostly along convergent boundaries
- - - - Moving magma can deform the ground
        
        Geysers, hot springs, and mud spots
        
        Increase of gas emissions
        
        Magma can start earthquakes
        
        Water Samples
    - - Sulfur Dioxide released
        
        Global temperatures can decrease
- - - - Named after "Baron St. Helens
        
        First activity March 18
        
        Martch 24 - 20 quakes per hour
        
        March 27 - steam explosion
        
        March 28 - More steam
        
        April 1 - plumes of steam and ash
        
        1 more item...