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Powerpoint ii
 

Powerpoint ii

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    Powerpoint ii Powerpoint ii Presentation Transcript

    • Volcanoes: What They are and How They Work
      Presentation By Justin Ventline
    • Agenda
      • How They are Formed
      • What the are made of
      • Where they are located
      • Different types
      • What triggers an eruption
      • What happens during an eruption
      • The Aftermath
    • How They are Formed
      • Magma makes it way through the upper mantle to the earths surface.
    • How They Are Formed
      • Once the magma makes it to the surface it is called lava, and the lava collects around the earths opening forming a mountain type shape
    • What They are Made Of
      • Once the lava cools in a mountain shape a young volcano has formed.
      • Also, the ash and rock that is moved will help form the volcano
    • What They are Made Of
      Lava
      Ash & Rock
    • Where they are located
      • Most volcanoes are found on the shores of oceans or seas where the earths plates are either colliding or separating
    • Where They are Located
      • A very famous string of volcanoes is called the “Ring of Fire”
      • The red dots or lines are once active or currently active volcanoes
      • Contains 452 volcanoes and over 75% of the worlds active volcanoes
      The Ring
      Of
      Fire
    • Different Types
      • There are 4 Types of Volcanoes
      • Cinder Cones
      • Composite
      • Shield
      • Lava Domes
    • Different Types
      Cinder = simplest types
      Composite = steepest and tallest
      Shield = slowly slopping or flat
      Domes = very wide but not very tall
      Cinder
      Composite
      Shield
      Domes
    • What Triggers an Eruption
      There are three theories of how a volcano erupts
      Magma rises due to pressure of gas
      Chemical changes in the gas and water
      New magma is injected into the volcano
    • What Triggers an Eruption
      There are also 3 types of eruptions
      Hawaiian
      Non-destructive and lava flows out slowly
      Strombolian
      Not dangerous but more impressive than Hawaiian
      Plinian
      Very Destructive, magma shoots 50km into the air, has been known to destroy cities and can destroy everything in its path
    • What Happens During an Eruption
    • What Happens During an Eruption
      • Magma is forced from the chamber up to the opening turning into lava
      • In some cases if there is enough pressure the lava will explode into the air or just flow
      • Gas and ash leave the volcano via the air.
    • The Aftermath
      Towns or villages in the area can be destroyed
      The gas and ash in the air can block the sun for days, causing the temperature to lower for 1-3 years!!!
      The volcano will grow in size due to the lava and rock hardening
    • References
      Clearly Ambiguous,Scott Robinson
      Oligarki,Richard
      Aprilandrandy,April and Randy
      Dom Dada,Dominik
      Wheeling Jesuit , Initials. (2004, November 24). Exploring the envrionment of volcanoes. Retrieved from http://www.cotf.edu/ete/modules/volcanoes/vlocation.html
      Olaf141, Gus MacLeod
      watson, JW. (1997). Principle types of volcanoes. Retrieved from http://pubs.usgs.gov/gip/volc/types.html
      Pillai, MP. (2010). Volcanic eruptions: what makes volcanoes erupt. Retrieved from http://www.buzzle.com/articles/volcanic-eruptions-what-causes-volcanoes-to-erupt.html
      www.yourdictionary.com/ahd/v/v0139800.html
      http://www.orbitforkids.com/doubletakes/purple/dt_p_awesomeforces.html