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