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Major Plates of the World

Major Plates of the World. Plate Boundaries. All plates have boundaries with other plates Three main types. http://geology.csupomona.edu/drjessey/class/gsc101/boundaries.gif. Continental-Continental Convergence. Mountain building Folded mountains Thrust-faulted mountains

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Major Plates of the World

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  1. Major Plates of the World

  2. Plate Boundaries • All plates have boundaries with other plates • Three main types http://geology.csupomona.edu/drjessey/class/gsc101/boundaries.gif

  3. Continental-Continental Convergence • Mountain building • Folded mountains • Thrust-faulted mountains • Both plates are of equal density so they push into each other pushing crust up. http://pubs.usgs.gov/publications/graphics/Fig21contcont.gif

  4. Oceanic-continental convergence • Oceanic plate is more dense, so it sub ducts under the continental crust • Causes trenches • Longest-Peru/Chile • Deepest- Mariana • Place of earthquakes and volcanoes • Called a subduction zone • Destroys crust http://pubs.usgs.gov/publications/graphics/Fig21oceancont.gif

  5. Oceanic/Oceanic Convergent • When two oceanic plates collide one plate slides under the other. • Volcanoes form on ocean floor • Could form volcanic island arc http://www.doeacckolkata.in/Piyali-geography/boundary2.jpg

  6. Convergent Boundary Video • Click: Convergent Boundary Formation

  7. Rift Valley in Iceland Divergent Plates • Plates move away from each other. • Forming • New crust • Mid ocean ridges • Rift valleys • Fissure volcanoes • Flood lavas http://pubs.usgs.gov/publications/graphics/lava_fountains.gif http://pubs.usgs.gov/publicatios/graphics/Fig16.gif

  8. Rift Valleys on Land Land is thinning- eventually will sink/break and fill with water http://www.etravelphotos.com/photos/2003ea/2003ea-001-03s-w.jpg

  9. Divergent Plate Boundaries – Pull Apart Click for Divergent Plate Video http://geology8b-9.wikispaces.com/file/view/d.jpg/88987877/d.jpg

  10. Divergent – Mid-Atlantic Ridge Click: Formation of Ocean Crust Click: Process of Rifting http://geology.wr.usgs.gov/parks/pltec/noaaMidAtlanticRidgeL.jpg

  11. Transform Boundaries • When two plates slide past each other horizontally. • Strike slip faults • San Andreas Fault http://pubs.usgs.gov/publications/graphics/San_Andreas.gif

  12. Summary of Types of Plate Boundaries Click: Summary Video of Plate Boundary Formation Table 2-1, p. 47

  13. Show Animations for Plate Boundaries • Click: Plate Boundary Animations

  14. Hot Spots • Areas that lie farfrom plate boundaries • Magma rises to surface • As plate moves, volcano becomes inactive • Creates volcanic mountains • Hawaii Click: Hot Spot Formation http://www.galapagosonline.com/Galapagos_Natural_History/Geology/HotSpot.jpg

  15. Click: Video Hotspot Volcanism

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