551 volcanoes tgale
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Transcript

  • 1. VOLCANOES
  • 2. Learning Objectives
    • Define volcano
    • Describe how volcanoes form
    • Explain what causes an eruption
    • Name the different types of volcanoes and their main characteristics
    • Know where most volcanoes are located
  • 3. What is a Volcano?
    • An opening in the earth's crust through which molten lava, ash, and gases are ejected.
    • A vent connects magma from within the Earth’s crust to the Earth's surface.
    • It includes the surrounding cone of erupted material.
    • Magma reaching the surface is called lava.
  • 4. Volcano Formation
    • Magma rises to the Earth’s surface and bursts out.
    • Most form along plate boundaries or under the sea at:
      • Spreading ridges where plates pull apart.
      • Subduction zones where one plate is forced under another.
      • Hot spots in the middle of plates when especially hot currents of magma shoot up, burning through the crust.
    Spreading Ridge Hot Spot
  • 5. Eruptions
    • Magma, less dense than the solid rock around it, rises and collects in chambers.
    • Pressure decreases, trapped gasses expand, and propel magma, causing an eruption.
    • Explosive if magma viscous; gasses can not escape; pressure builds; explodes.
    • Effusive if magma is fluid; gasses can escape easily; lava flows.
    • Build a volcano and watch it erupt .
  • 6. Different Types of Volcanoes: Composite
    • Most common type.
    • Explosive eruptions and lava flow.
    • Built from pyroclastic material and lava.
    • Example:
    • Mt. Rainier, Washington
  • 7. Different Types of Volcanoes: Shield
    • Built from layers of lava
    • Non-explosive eruptions
    • Not very steep, but can be big
    • Example:
    • Mauna Loa, Hawaii
  • 8. Different Types of Volcanoes: Cinder Cone
    • Built from pyroclastic material
    • Moderately explosive, short eruptions
    • Small in size, steep slopes
    • Example:
    • Mauna Kea,
    • Hawaii
  • 9. Where Are They?
    • Volcanoes are located on much of the planet, but there is a high concentration surrounding the Pacific Ocean.
    • This area is known as The Ring of Fire.
    Volcano Locations
  • 10. Assignment
    • Research and report on a specific volcano
    • (ex: Mauna Loa in Hawaii)
    • Required details
      • Name
      • Location
      • Type of volcano and main characteristics
      • Size
      • Last eruption date and status (active, extinct, dormant)
      • Picture
    • Report options
      • Poster, PowerPoint, Video, Essay
      • If you have a different idea, ask teacher for approval
  • 11. Additional Learning Resources
    • Discovery Kids – Build a virtual volcano and watch it erupt, plus more
    • http:// kids.discovery.com /games/build-play/volcano-explorer
    • National Geographic – Volcano video clips http://video.nationalgeographic.com/video/player/environment/environment-natural-disasters/volcanoes/volcanoes-101.html
    • National Geographic Kids - animated movie
    • http://magma.nationalgeographic.com/ngexplorer/0405/quickflicks/
    • BBC Newsround – video clips and information
    • http://news.bbc.co.uk/cbbcnews/hi/specials/volcanoes/default.stm
    • Lessons, activities, videos
    • http://science.lotsoflessons.com/volcanoes.html
  • 12. Content Standards
    • Science Content Standards – CAPA Level V
    • SEACO Special Education Guide
    • Standard 9/12.3e - Students know there are two kinds of volcanoes: one kind with violent eruptions producing
    • steep slopes and the other kind with voluminous lava flows producing gentle slopes
    • Alternate Achievement Standard 9/12.3e.A - Know the general characteristics of a volcano.
    • FPI S5E9/12.3e.A1 - Will know two types of volcanoes (violent eruptions or voluminous lava flow)