2. Plate Tectonics Myers Social Studies

3. Layers of the Earth Draw a circle in your notebook Now draw a SLIGHTLY smaller circle inside this one Draw a small circle in the middle And one more smaller circle in the middle

4. Label your drawing Mantle Crust Outer Core Inner Core

5. Look at this

6. Label your drawing Magma Made of Rock Liquid Solid

7. The Earth’s Surface

8. Plate Tectonics Watch this video to introduce the concept of Plate Tectonics

9. Theories of Continental Drift 1912 – Alfred Wegener used fossil evidence to explain continental drift His theory was not accepted until years later

10. Eventually sonar Technology that was developed to locate German Uboats

17. was used during the 1960s to map the ocean floor

24. Finally scientists had a more accurate picture of the earth’s surface The mapping also revealed several faults below the ocean’s surface Confirming the existence of the earth’s plates

25. What are Plate Tectonics Theories? The outer shell of the earth has several plates The plates move on a layer of liquid rock located miles below the surface The plates move slowly across the earth 200 million years ago – one giant continent existed called Pangea

26. Pangea

27. How Many Plates are There? There are around 30 plates –12 of them are considered major tectonic plates

28. What are the Plates Made of? Partly crust Partly mantle Averages 60 miles thick Could be anywhere from 5 – 120 miles thick

29. What are Faults? Faults are cracks that exist on the edges of plates. The plates movement against each other can cause serious, sometimes visible cracks in the Earth’s crust

30. How Fast do Plates Move? The move somewhere between 1 inch and 8 inches in a year One Inch 8 inches

31. How do These Huge Plates Move? The plates move on a flowing layer of rock in the mantle called the Asthenosphere The Asthenosphere reaches temperatures of 3600 degrees

32. Where are the Plates Going? In several directions The Atlantic Ocean is growing The Pacific Ocean is shrinking

33. Where are the Plates Going?

36. Plate Interaction Divergent Plate Boundaries –Plates spread out or separate Causes volcanic activity Creates New land!

37. Plate Interaction Divergent Plate Boundaries –Plates spread out or separate Causes volcanic activity Creates New land!

38. Plate Interaction Divergent Plate Boundaries –Plates spread out or separate Causes volcanic activity Creates New land!

39. Divergent Video

40. Plate Interaction Convergent plate boundaries –Also called subduction Causes earthquakes, and volcanic activity Creates mountains –Andes, and the Himalayans

41. Plate Interaction Convergent plate boundaries –Also called subduction Causes earthquakes, and volcanic activity Creates mountains –Andes, and the Himalayans

42. Plate Interaction Convergent plate boundaries –Also called subduction Causes earthquakes, and volcanic activity Creates mountains –Andes, and the Himalayans

43. Convergent

44. Making Mountains?

45. Plate Interaction Transform Faults Creates Major Earthquake

46. Plate Interaction Transform Faults Creates Major Earthquake

47. Plate Interaction Transform Faults Creates Major Earthquake

48. Plate Interaction Transform Faults Creates Major Earthquake

49. Plate Interaction Transform Faults Creates Major Earthquake

50. Transform

51. Two Faults Illustrated