1. PLATE BOUNDARIES

2. Instructional Goals  Explain how each of the three plate boundaries are formed  Predict the resulting landforms from each boundary  Identify examples of plate boundaries

3. What do you know?  What do you know about earthquakes, mountains, etc?

4. Plate Boundaries  The place where two plates meet is called a plate boundary

5. Types of Plate Boundaries  Divergent  Convergent  Transform

6. Divergent Boundaries  Plates moving away from each other  Plate movement

7. What happens to the crust?  The crust is created

10. What do you get as a result?  Sea floor spreading

11. Examples of Divergent Boundaries  Mid-Atlantic Ridges  Iceland (rift area)  Red Sea  Lake Baikal  East African Rift

13. Convergent Boundaries  Plates are moving towards one another (colliding)  Plate movement  What happens at a convergent boundary depends on the plates

14. What happens to the crust?  The crust is destroyed

15. What do you get as a result?  What happens at a convergent boundary depends on the plates  Three types of convergent boundaries  Oceanic-continental  Oceanic-oceanic  Continental-continental

16. Oceanic-Continental: Results  - Subduction  Oceanic sinks because its more dense  Examples:  Andes Mountains  Mount St. Helens (Juan de Fuca subducts beneath the North American plate)

20. Oceanic-Oceanic: Results  oldest crust subducts  volcanic island chains  examples:  Philippines  Japan

23. Continental-Continental: Results  mountains  Examples  Himalayas  Appalachians  Rockies  Alps

26. Transform Boundary  forms everywhere ridge is not a straight line  two plates slide past each other

27. What happens to the crust?  The crust is conserved

29. What do you get as a result?  Faults

30. Examples  San Andreas Fault  Pacific Plate is moving faster than North American plate at a rate of about 2 cm per year

32.  http://www.learner.org/interactives/dynamicearth/ plate.html http://www.learner.org/interactives/dynamicearth/ plate.html  http://www.classzone.com/books/earth_science/ter c/content/visualizations/es0804/es0804page01.cf m?chapter_no=visualization http://www.classzone.com/books/earth_science/ter c/content/visualizations/es0804/es0804page01.cf m?chapter_no=visualization

33. How does it all connect?  Earth layers  Moving Plates  Continental Drift  Plate Boundaries  Divergent, convergent, transform fault  Earthquakes, volcanoes and mountains and things

36. Journal  “Tectonic” comes from the Greek word tektonikos, which means “of a builder”. Why is this word appropriate for tectonic plates? In what ways are tectonic plates responsible for building/destroying features of the Earth’s surface?