1. Volcanoes: What They are and How They Work Presentation By Justin Ventline

3. What the are made of

4. Where they are located

5. Different types

6. What triggers an eruption

7. What happens during an eruption

11. The red dots or lines are once active or currently active volcanoes

12. Contains 452 volcanoes and over 75% of the worlds active volcanoesThe Ring Of Fire

14. Cinder Cones

15. Composite

16. Shield

18. 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

19. 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

20. What Happens During an Eruption

22. In some cases if there is enough pressure the lava will explode into the air or just flow

24. 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