1. Sea-Floor Spreading 10/3/14 7-2b pgs. 175-176  IN: List 3 pieces of evidence Wegener found to help support his theory of continental drift. Glue in the diagram Put your Pangaea Puzzle on the books

3. What is Wegener’s Evidence?  Fossils of the same plant and animal species are found on both sides of the Atlantic Ocean.

4. What is Wegener’s Evidence?  Similar types of rock and evidence of the same ancient climatic conditions were found on several continents.

6. What is Wegener’s Evidence?  Split mountain ranges.

7. More Evidence  Meteorite strike.

9. http://geology-guy.com/teaching/iac/animations/pangaea.htm

10. Do you believe his theory? What is Wegener still missing?

11. Wegener could not explain What force is moving the continents? In 1930, Wegener died on a trip to Greenland.

12. In the 1950s, the ocean floor was surveyed in detail, that their full extent became known.

13. Mid-Ocean Ridges  Underwater mountain chains that run through Earth’s ocean basins.

14. Mid-Atlantic Ridge

16. Sea-floor Spreading  The process by which new oceanic lithosphere is created as older materials are pulled away.

17. Sea-floor Spreading  Remember oceanic crust is more dense than continent crust so it sinks down.

18. Sea-floor Spreading

19. Young rocks are near the Mid-Ocean Ridge Old rocks are closer to the coastlines.

23. Fig. 19.21 - Evolution of a Divergent Plate Boundary

24. Magnetic Reversal  When Earth’s magnetic poles change place.

26. Magnetic Reversals

27. OUT: Explain why Wegener’s Theory of Continental Drift was not correct.