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Tuesday, October 23 rd

Tuesday, October 23 rd. How do convection currents form ? a. heated mantle material is less dense and rises to the top of the asthenosphere b. mantle material cools under the lithosphere, becomes more dense, and sinks c. seismic waves act like a big spoon and stir up mantle material

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Tuesday, October 23 rd

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  1. Tuesday, October 23rd How do convection currents form? a. heated mantle material is less dense and rises to the top of the asthenosphere b. mantle material cools under the lithosphere, becomes more dense, and sinks c. seismic waves act like a big spoon and stir up mantle material d. both a and b are correct

  2. Corny Joke of the Day What did one mountain say to the other after the earthquake? “It isn’t my fault”

  3. Tier 2 PT= Tomorrow

  4. Quiz Answers 10 pts Each

  5. Project Grades Individual and Group

  6. Welcome to Ms. Evans Cheer Camp

  7. When I say transform you say Slide

  8. Transform

  9. Transform

  10. When I say Divergent you say Apart

  11. Divergent

  12. Divergent

  13. When I say convergent you say Collide

  14. Convergent

  15. Convergent

  16. Review Plate Tectonics #2Convergent Boundaries

  17. A convergent boundary is where two plates come together, or converge. The result of the plates hitting together is called a collision.

  18. There are three combinations of how earth's crust can come together. a. Continental crust to continental b. Continental crust to oceanic c. Oceanic crust to oceanic

  19. a. Continentalcrust to continentalcrust Before collision MOUNTAINS Example: India-Asia (Himalayas) After collision from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270

  20. Eurasian plate Indian plate Indian plate (continental crust) running into Eurasian plate (continental crust)

  21. Himalaya Mountains From space

  22. Even the Appalachian Mountains!

  23. Folded mountains – notice the rock layers

  24. b. Continental &Oceanic SUBDUCTION

  25. The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is called Subduction

  26. Why Does the Oceanic Crust sink below the Continental Crust? Oceanic crust is MORE DENSE than Continental!

  27. Because one plate gets pushed under another, it is called subduction. • This is where volcanoes and trenchesform! all from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270

  28. Volcanoes form where a convergent boundary occurs between oceanic crust and continental crust.

  29. South American plate (continental crust) running into Nazca plate (oceanic crust)

  30. Andes Mts. From space View looking south – ocean to continental

  31. c. Oceanic &Oceanic SUBDUCTION

  32. Volcanoes also form where a convergent boundary occurs between oceanic crust and oceanic crust.

  33. Aleutian islands of Alaska are volcanoes formed by oceanic crust converging with oceanic crust

  34. Following volcanic islands in the Pacific Ocean can show us where oceanic crust is being subducted by oceanic crust.

  35. Review Plate Tectonics #3Divergent Boundaries

  36. The place where two plates move apart or diverge is called a divergent boundary.

  37. #1 Sea floor spreading Can you explain this diagram!?

  38. What causes sea floor spreading?

  39. This is a model of sea floor spreading at a divergentboundaryis called a mid ocean ridge.

  40. Oceanic crust diverging from oceanic crust

  41. : www.ocean.udel.edu Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball!

  42. Divergence can also occur in continental crust! Continental crust diverging from continental

  43. African rift valley

  44. Iceland’s rift valley

  45. Review Plate Tectonics #4Transform Boundaries

  46. Plates can also slide past each other. A transform boundary is a place where two plates slip past each other, moving in opposite directions.

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