chapter 9 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 9 PowerPoint Presentation
Download Presentation
Chapter 9

Loading in 2 Seconds...

play fullscreen
1 / 33

Chapter 9 - PowerPoint PPT Presentation


  • 215 Views
  • Uploaded on

Chapter 9. Volcanoes. Section 1. _________ : mountain that forms when layers of lava and volcanic ash erupt and build up. Magma is _________ dense than the rock around it, so it very slowly rises toward Earth’s surface.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

Chapter 9


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
    Presentation Transcript
    1. Chapter 9 Volcanoes

    2. Section 1 • _________ : mountain that forms when layers of lava and volcanic ash erupt and build up

    3. Magma is _________ dense than the rock around it, so it very slowly rises toward Earth’s surface

    4. _________ : opening through which _________ flows out on to Earth’s surface

    5. Factors that Affect Eruptions • 1) Water Vapor and Trapped Gases: gas that gets trapped under high pressure eventually escapes, causing explosive eruptions • (slow release = _________ eruption)

    6. 2) Composition of Magma • A) _________ magma: contains little silica, is very _________ , and produces quiet, _________ eruptions

    7. B) _________ magma: is thick with a lot of silica which causes pressure to build, also has a lot of water vapor, which causes _________ eruptions

    8. Section 2

    9. _________ : opening at the top of a volcano’s vent

    10. Types • _________ Volcano: broad volcano with _________ _________ sides formed by _________ eruptions of basaltic lava • Ex. Hawaiian Islands

    11. _________ _________ Volcanoes: _________ , loosely consolidated volcano formed from falling tephra • Tephra: lava erupted into the air and cooled also known as _________

    12. _________ Volcano: cycle of lava and tephra is repeated over and over at convergent boundaries above subduction zones

    13. Formations • Batholiths: largest intrusive igneous rock body formed when huge bodies of magma cool underground and stop rising • Ex. Granite domes (Yosemite National Park)

    14. Formations • Dike: magma that is squeezed into a vertical crack and hardens

    15. Formations • Sill: magma that is squeezed into a horizontal crack and hardens

    16. Formations • Laccolith: dome of rock formed when magma that forms a sill may continue to push the rock layers upward

    17. Formations • Volcanic Neck: in a dead volcano, the cone erodes away first, leaving behind this solid igneous core

    18. Formations • _________ : after an eruption, the top of a volcano may collapse down into the vent, thus a very large opening is formed

    19. Section 3

    20. Where Do Volcanoes Occur? • 1) _________ Boundary: magma flows from rifts and is instantly cooled by seawater. It builds up from the seafloor, sometimes rising high enough to from islands • Ex. Iceland

    21. 2) _________ Boundaries: magma that is created in the subduction zone works its way to the surface, forming volcanoes • Ex. Mount Saint Helens

    22. Pacific _________ of _________ : area around the pacific plate where earthquakes and volcanoes are common

    23. 3) _________ _________ : areas in the mantle that are hotter than others. The melted rock rises toward the crust as magma

    24. Ex. Hawaiian Islands • (plate is moving but hot spot is stationary)

    25. Additional Information • Geothermal Energy: heat from magma can be used to heat water and produce steam in a power plant, the steam is pressurized and spins generators that make electricity

    26. Additional Information • Would it be better to clear forests for geothermal energy or to continue releasing pollution into the atmosphere?