1. Convection Currents - driving forces of plate tectonics - very hot material at the deepest part of the mantle rises, then cools and sinks again, then repeating. This cycle is repeated over and over. ***Remember…this heat is generated by the core!! HOT!!!!

3. How Plate Tectonic Works The Asthenosphere is also moving in convection currents(created by unequal heating), carrying the plates outward. As magma heats up and rises, it exits through the rift in the middle of the mid-ocean ridge. It cools and pushes the plates apart.

4. What is the average rate of movement from lithospheric plates? 5cm/yr (2inches) and it is driven by unequal heating of the Earth.

5. Plate Boundaries 1. Convergent – moving together 2. Divergent – moving apart 3. Transform – moving side by side Last slide to write anything. Just read and look at the rest of the slides.

6. Convergent Boundary – Oceanic & Oceanic http://pubs.usgs.gov/gip/dynamic/understanding.htmlhttp://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.comhttp://www.geology.com

7. Aleutian Islands, Alaska, May 23, 2006

8. Convergent Boundaries Continental - Continental http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.comhttp://www.geology.com

9. Himalayan Mountains

10. Convergent Boundary – Oceanic & Continental http://pubs.usgs.gov/gip/dynamic/understanding.htmlhttp://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.comhttp://www.geology.com

11. Mt. St. Helen – Cascade Mtns. May 20, 1980

12. Divergent boundary – Continental - Continental

13. Divergent Boundary – Arabian and African Plates

14. Divergent Boundary Oceanic - Oceanic

18. Transform Boundary – San Andreas Fault www.geology.com

19. San Andreas Fault

20. Train crossing San Andreas Fault – Cajon Pass, CA

21. Draw – Alongs!