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PLATE TECTONICS

PLATE TECTONICS

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PLATE TECTONICS

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  1. PLATE TECTONICS http://volcano.und.edu/vwdocs/vwlessons/plate_tectonics/introduction.html

  2. Continental Crust • Cooling rate • Crystal size • Density • Composition • Thickness http://www.amonline.net.au/geoscience/images/earth_diagrams/cont_oceanic_crust.gif

  3. Oceanic Crust • Cooling rate • Crystal size • Density • Composition • Thickness http://faculty.weber.edu/bdattilo/parks/plume_ocean.jpg

  4. Lithosphere/Asthenosphere

  5. Tectonic Plate • is a rigid piece of lithosphere floating on a partially plastic substrate (asthenosphere).

  6. Pangea http://geology.csupomona.edu/drjessey/class/Gsc101/Plate.html

  7. http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Pangaea.shtmlhttp://www.enchantedlearning.com/subjects/dinosaurs/glossary/Pangaea.shtml

  8. http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Pangaea.shtmlhttp://www.enchantedlearning.com/subjects/dinosaurs/glossary/Pangaea.shtml

  9. Evidence for Plate Tectonics • Continents ‘fit’ together

  10. Evidence for Plate Tectonics • Continents ‘fit’ together • Fossil evidence

  11. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations

  12. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations • Climate distribution

  13. Location of Trenches, Ridges, Mountains http://geology.csupomona.edu/drjessey/class/Gsc101/Plate.html

  14. http://geology.csupomona.edu/drjessey/class/Gsc101/Plate.htmlhttp://geology.csupomona.edu/drjessey/class/Gsc101/Plate.html

  15. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations • Climate distribution • Location of mountain ridges, rifts, mid-ocean ridges, trenches

  16. Testing the Sea-Floor Spreading Hypothesis

  17. Magnetization http://www.ucmp.berkeley.edu/geology/tecmech.html

  18. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations • Climate distribution • Location of mountain ridges, rifts, mid-ocean ridges, trenches • Magnetic pattern of rock

  19. Same Age Rocks http://geology.csupomona.edu/drjessey/class/Gsc101/Plate.html

  20. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations • Climate distribution • Location of mountain ridges, rifts, mid-ocean ridges, trenches • Magnetic pattern of rock • Common rock formations: same age

  21. Volcano http://cgz.e2bn.net/e2bn/leas/c99/schools/cgz/accounts/staff/rchambers/GeoBytes%20GCSE%20Bl og%20Resources/Images/Plate%20Tectonics/Plate%20Tectonics/VolcanoStructure.jpg

  22. Earthquake • http://news.bbc.co.uk/nol/shared/spl/hi/world/04/earthquake/img/earthquake.gif

  23. Ring of Fire http://pubs.usgs.gov/gip/dynamic/understanding.html

  24. The Hawaiian - Emperor Volcanic Chain

  25. LOCATION OF HOT SPOTS

  26. Evidence for Plate Tectonics • Continents fit together • Fossil distribution • Glacier evidence: deposits, striations • Climate distribution • Location of mountain ridges, rifts, mid-ocean ridges, trenches • Common rock formations: same age • Magnetic pattern of rock • Location of earthquakes and volcanoes

  27. How does it work?

  28. Wegener’s Continental Drift

  29. Wegener’s Theory Problems • Continents plowing through the crust would destroy the crust • Continents are not moving apart at the speed Wegener proposed

  30. Didn’t have a good explanation of the mechanism involved

  31. Holme’s Convection Currents

  32. Convection currents • Gravity causes the heated mantle to sink • The mantle heats up near the core and then rises again • Conduction is the transfer of heat between 2 materials in direct contact with each other library.thinkquest.org/C003124/images/convect.jpg http://www.wisc-online.com/objects/index_tj.asp?objID=SCE304 Click animation

  33. Movement of mantle by convection allows melting and force to move plates

  34. CONVECTION

  35. http://geology.csupomona.edu/drjessey/class/Gsc101/Plate.htmlhttp://geology.csupomona.edu/drjessey/class/Gsc101/Plate.html

  36. Hot Spots – Hawaiian Islands http://geology.com/nsta/plate-tectonics-cover.gif