1. Tectonic Plates Review the Layers Alfred Wenger’s Pangaea
Sea Floor Spreading
Magnetic Reversal

2. The Earth has Layers

3. Alfred Wegener 1880 - 1930 Continental Drift Theory 1913
Theory had few believers
Continental drift became Plate
Tectonics in the 1970s

4. OK…but where’s your evidence??
Fossils on two separate coasts…
Similar climate conditions
Glacier cuts

5. Pangaea Pangaea=“all Earth” Panthalassa=“all sea”
180 million years ago
245 million years ago

6. Gon-da-wan-na-who?!
Laurasia
Gondwana
But what’s a strong enough force to move continents??

7. Dr. Evil?

8. Chuck Norris?

9. Mr. Kotsch?

10. The Secret: Sea Floor Spreading

11. Directions of Plates Now
Plates on the move
Directions of Plates Now

12. Mid-Ocean Ridges

13. Earth’s Magnetic Field

14. Magnetic Stripes

15. Slab Pull-Push

17. Boundaries

18. Boundaries cont.

19. Faults

20. Normal Fault

21. Normal Fault cont.

22. Reverse Fault

23. Reverse Fault cont.

24. Strike-Slip Fault

25. Strike-slip cont.

26. Folds

27. Anticline and Syncline