2. OCR-A AS Plate tectonics

3. Convection currents

6. Internal structure

11. Plate margins

12. Types of margins Types of Margins

13. 1. Constructive Boundaries

14. Magnetic banding

17. (I) Constructive Ocean+Ocean Plate eg Mid Atlantic Ridge (North American + Eurasian Plate)

18. Iceland rift

19. Thingvellir, Iceland

20. (II) Continental+Continental Plate Eg East African Rift Valley (African and Indian Plate)

21. 2. Destructive Boundaries

22. Pacific Ring of Fire

23. (I) Ocean+Continental Plates - eg Peru, Andes (eg Nazca and South American Plates)

24. Andes

25. (ii)Ocean + Ocean Plates Eg. Marianus Trench (Pacific and Philippine Plates)

26. (iii) Continental+Continental Eg Himalayas, Nepal (Indian+Eurasian Plates)

29. Tibetan plateau

30. 3. Transform Boundaries

31. Eg. The San Andreas Fault, California, USA

32. Off-set Highway on the San Andreas Fault

33. Valleys along the fault line

34. Gap theory

35. Hot spots Plumes of hot mantle rising to the surface

36. Hot Spots > a small area of the earth’s crust where an unusually high heat flow is associated with volcanic activity

37. World Hot Spots

38. The Trail of Hot Spots

39. Any Questions…….