1. Plate Tectonics

2. Plate Boundaries Heat Transfer Three types…  Conduction  Radiation  Convection

3. Heat transfer  Conduction – heat energy transfer between objects by direct contact; touching (solid)  Radiation – heat energy transfer through space (‘air’) ; in the form of ‘short waves’  Convection – heat energy transfer by movement within a ‘fluid’; circular movement of “convection currents”

4. Convection Currents

5. Convection Currents in the Mantle Convection Currents – within the asthenosphere (and perhaps the upper mantle), convection currents are the driving force of plate movement.

6. Forces between plates TTTTension – two plates pulling apart CCCCompression – two plates pressing into each other SSSShearing - two plates sliding/grinding past each other.

7. Plate Boundaries (divergent boundary) TENSION: Divergent boundary Two plates moving away from each other creating new crust  within oceanic area – sea floor spreading  within continental area – rift valley

8. Plate Boundaries TENSION: Divergent boundaries Within a continent – African Rift, aka Red Sea Within an ocean – Mid-Ocean Ridge

9. Progression of a Divergent Boundary

10. Plate Boundaries COMPRESSION: Convergent Boundary Convergent Boundary Two plates moving toward each other; the behavior/results depend on the type of crust…

11.  Ocean – Continent convergent boundary – subduction zone (destruction of crust), volcanic mountain chain Plate Boundaries (convergent boundary)

12.  Continent – Continent convergent boundary - construction (yes construction) of crust, mountains Plate Boundaries (convergent boundary)

13. India into Asia

14. Plate Boundaries (convergent boundary)  Ocean – Ocean convergent boundary – subduction zone, (destruction of crust), volcanic island arc

17. Plate Boundaries (Transform Boundary) Shearing - Transform boundary  Two plates sliding / grinding past each other

18. Plate Boundaries (Transform Boundary)

19. Most transform boundaries are associated with ‘fracture zones’ along the mid-ocean ridge

20. Convection Currents in the Mantle

21. Plate Boundaries (Transform Boundary)

25. Boundaries for lab

26. ~ THE END ~ Keep going…

32. Extra Credit Find a recent article relating to Earth Science and write a review & a reflection (3-5 paragraphs)… Sneak it to me at BEFORE I leave on March 6 th, 2013