1. Plate Boundaries

2. Continental Drift Review Breakup of Pangaea Future Plate Movement Animation

3. Sea Floor Spreading http://www.classzone.com/books/earth_sci ence/terc/content/visualizations/es0803/es 0803page01.cfm?chapter_no=visualizatio nhttp://www.classzone.com/books/earth_sci ence/terc/content/visualizations/es0803/es 0803page01.cfm?chapter_no=visualizatio n

4. What causes plates to move? A- Ridge push- Material from mid-ocean ridges pushes the plates B- Convection Currents- in the mantle, molten rock rises, cools, then sinks, pushing the plates with the current C- Slab Pull- Gravity pulls cooler, denser plates into mantle

5. Diagram

6. Plate Boundaries Convergent- “coming together” Divergent- “separating” Transform- “scraping past”

7. Convergent Boundaries There are 3 types: –Continental-Continental –Continental-Oceanic –Oceanic-Oceanic

8. Continental-Continental Collisions Responsible for creating… – continental mountain ranges Examples: –Himalayas –The Alps

9. Continental-Continental Collisions DIAGRAM Convergent boundary MANTLE (Asthenosphere) Mountain Range

10. 2 converging continental plates

12. Continental-Oceanic Collisions Also called a Subduction zone Responsible for creating… –Volcano ranges –Oceanic Trenches (write this in) Example: –Cascade Range (WA and OR) –Andes mountains

13. Continental-Oceanic Collisions Diagram Continental Crust Oceanic Plate MANTLE (Asthenosphere) Trench

14. Convergent boundary -subduction zone-

15. The Andes Mountains Trench

16. Oceanic-Oceanic Collisions Responsible for creating… –Volcanic Island Chains –Oceanic Trenches Examples- –Japan, The Phillipines –Mariana Trench in the Pacific Ocean

17. Oceanic-Oceanic Collisions Diagram Oceanic Plate Trench MANTLE (Asthenosphere)

18. http://www.platetectonics.com/book/images/Convergence2.gif

19. http://www.dkimages.com/discover/previews/875/20120887.JPG

20. Mariana Trench- http://upload.wikimedia.org/wikipedia/commons/1/13/Mariana_trench_location.jpg

21. Divergent Boundaries “When plates go their separate ways…”

22. Divergent Boundaries Occur when two tectonic plates separate from each other Responsible for –Sea-floor spreading –Mid-ocean ridges –Rift valley (on land) Examples: Mid-Atlantic Ridge (oceanic); Great Rift Valley (E. Africa)

23. Divergent Boundary Diagram MANTLE (Asthenosphere) PLATE Parting is such sweet sorrow…

24. Divergent boundary -Two plates move apart- Animation http://www2.nature.nps.gov/GEOLOGY/usgs nps/animate/A48.gif

25. Mid-Atlantic Ridge

26. Great Rift Valley earth.imagico.de/views/eafrica_large.jpg

27. Transform Boundaries “friction never felt so good” (unless you live in California)

28. Transform Boundary Occur when two tectonic plates scrape past each other horizontally Responsible for most earthquakes –Earthquakes can occur at any plate boundary Example: San Andreas Fault, CA

29. Transform Boundary Diagram

30. San Andreas Fault, CA http://nationalatlas.gov/articles/geology/features/images/sanandreas.jpg

31. http://pubs.usgs.gov/gip/dynamic/graphics/San_Andreas.gif

32. Wrapping Up http://www.classzone.com/books/earth_sci ence/terc/content/visualizations/es0804/es 0804page01.cfm?chapter_no=visualizatio nhttp://www.classzone.com/books/earth_sci ence/terc/content/visualizations/es0804/es 0804page01.cfm?chapter_no=visualizatio n