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Volcanoes

Volcanoes. What is a volcano?. An opening in the Earth that erupts gases, ash, and lava. http://www.youtube.com/watch?v=xExdEXOaA9A. Mountains form when layers of lava, ash, and other materials build up around these openings. How are volcanoes formed?. Convergent/Destructive volcanoes.

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Volcanoes

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  1. Volcanoes

  2. What is a volcano? • An opening in the Earth that erupts gases, ash, and lava. http://www.youtube.com/watch?v=xExdEXOaA9A

  3. Mountains form when layers of lava, ash, and other materials build up around these openings.

  4. How are volcanoes formed?

  5. Convergent/Destructive volcanoes

  6. At convergent/destructive boundaries, one plate subducts (sinks) under the other, the plate melts and magma is forced to the surface. • These volcanoes have the most violent eruptions • http://www.classzone.com/books/earth_science/terc/content/visualizations/es0902/es0902page01.cfm?chapter_no=visualization

  7. Divergent/Constructive volcanoes

  8. At divergent/constructive boundaries, plates move apart and magma rises to the surface. • Also known as seafloor spreading. • These eruptions are not as violent • http://www.classzone.com/books/earth_science/terc/content/visualizations/es0903/es0903page01.cfm?chapter_no=visualization

  9. Hot Spot

  10. Hot Spots • Form in the middle of plates. • As the plate moves, new volcanoes are created.

  11. 2 1 • When the plate moves, the older volcanoes lose their magma source and are now dormant (inactive) 3 1 2 • http://www.classzone.com/books/earth_science/terc/content/visualizations/es0904/es0904page01.cfm?chapter_no=visualization

  12. Iceland • Divergent

  13. Geothermal Activity on Iceland

  14. Surtsey

  15. Natural geothermal pools

  16. Geysers and mud pots

  17. Hawaii http://www.youtube.com/watch?v=bYv6V5EJAKc • Hot Spot

  18. Hot Spot Locations http://mms.nps.gov/yell/ofvec/exhibits/eruption/volcanoes/hotspot3.htm

  19. Soufriere Hills in Montserrat • Convergent

  20. If the Pacific Plate stops moving, what will happed to the Big Island of Hawaii? X

  21. It will just keep getting bigger!

  22. What destruction can volcanoes cause?

  23. Block roadways

  24. Collapse buildings www.maps.google.com

  25. Lahars • Mudslides created by volcanic eruption • Heat from volcano melts glaciers on mountain • Will usually take out everything in its path

  26. Can cause lung disease in animals and humans

  27. Ring of Fire -a chain of convergent volcanoes found circling the Pacific Ocean

  28. http://www.youtube.com/watch?v=-H_HZVY1tT4 http://www.classzone.com/books/earth_science/terc/content/investigations/es0810/es0810page01.cfm?chapter_no=investigation How fast do plates move computer investigation

  29. Volcano Review

  30. Where do we find most volcanoes? • Near plate boundaries

  31. What are the three types of volcanoes? • Convergent, divergent, and hot spot

  32. What and where is the Ring of Fire • A chain of volcanoes circling the Pacific Ocean

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