1. PS 2-7-08 Plate Tectonics

2. Big Question What part of the Earth moves and why Compare diverging boundaries, converging boundaries and transform boundaries

3. Oceanic meets Continental crust The west Coast of the US around Seattle and Portland

4. West Coast

5. Ocean-vs-Continent More dense ocean crust is push beneath Continental crust When it is pushed deep enough it begins to melt The melted material is pushed upward, supplies material for volcanos

6. Magma and Lava Magma Lava

7. Continental material meets other continental material The mountains between India and China

8. Subduction zone –The Himalayas

9. Continent –vs-Continent Nothing is pushed down much, similar density Build Mountains Keep building as long as pushing occurs No volcanos

10. Ocean-vs-Ocean All based on age of rock, the oldest material is pushed under Creates volcanic islands, or island ars

11. Subduction zone - Japan

12. One final type of boundary interaction TRANSFORM BOUNDARY

13. Southern California San Andreas Fault

14. Transform Moves past each other Not creating or destroying material Earthquakes

15. Plate Tectonics Describes continental movement Describes why and how continents move

16. What is a plate? A plate is made up of a section of the earth’s crust and lithosphere underneath it Lithosphere is brittle, so it breaks into pieces under enough force

17. How do plates move? New crust and lithosphere is made at diverging boundaries This new material pushes the old material away The Asthenosphere bends to allow the plates to move

18. Tectonic plates of the world

21. What happens to the islands that enters into a Subduction zone? Scraped off and added to the bigger continent The northern Californian coast Some evidence about the land we sit on Microplate Terrane

22. Review Plate Tectonics Diverging Boundaries Converging Boundaries Transform Boundaries

23. To sum up Plate Tectonics What moves Cause of motion Interactions between plates Diverging Boundaries Creation of Plates Rift Valleys

24. Review Converging boundaries Destruction of plates 3 different scenarios Volcanic activity Mountain building Transform boundaries Move past each other No overlap Earthquakes no volcanoes

25. Homework Worksheet: –Do all multiple choice questions –Question 2 and 3 critical thinking

26. Make your own world On a piece of paper, create a map of a world of your design Divide up the world using at least 2 diverging and 2 converging boundaries

27. The rock cycle