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Lecture10

Table of Contents

  1. Motion Inside Earth
  2. Why study Earth's internal motion?
  3. Why study Earth's internal motion?
  4. Why study Earth's internal motion?
  5. Why study Earth's internal motion?
  6. Why study Earth's internal motion?
  7. Why study Earth's internal motion?
  8. Why study Earth's internal motion?
  9. Why study Earth's internal motion?
  10. Why study Earth's internal motion?
  11. 10.1 How does convection work?
  12. Convection
  13. 10.1 How does convection work?
  14. 10.1 How does convection work?
  15. 10.1 How does convection work?
  16. 10.1 How does convection work?
  17. 10.1 How does convection work?
  18. 10.1 How does convection work?
  19. 10.2 What does mantle convection look like?
  20. 10.2 What does mantle convection look like?
  21. 10.2 What does mantle convection look like?
  22. 10.2 What does mantle convection look like?
  23. 10.2 What does mantle convection look like?
  24. 10.2 What does mantle convection look like?
  25. 10.2 What does mantle convection look like?
  26. 10.2 What does mantle convection look like?
  27. 10.2 What does mantle convection look like?
  28. 10.3 How does outer-core convection generate the magnetic field?
  29. 10.3 How does outer-core convection generate the magnetic field?
  30. 10.3 How does outer-core convection generate the magnetic field?
  31. 10.3 How does outer-core convection generate the magnetic field?
  32. 10.3 How does outer-core convection generate the magnetic field?
  33. 10.3 How does outer-core convection generate the magnetic field?
  34. 10.3 How does outer-core convection generate the magnetic field?
  35. 10.3 How does outer-core convection generate the magnetic field?
  36. 10.4 How do we know ... Earth's core is a dynamo?
  37. 10.4 How do we know ... Earth's core is a dynamo?
  38. 10.4 How do we know ... Earth's core is a dynamo?
  39. 10.4 How do we know ... Earth's core is a dynamo?

Text and Images from Slide

10.3 How does outer-core convection generate the magnetic field?

Cross section of earth showing Magnetic North

Fig 10.10

Magnetized materials align themselves with the direction of Earth's magnetic field and the magnetic field is aligned almost to the rotational axis. This fact was utilized by explorers and navigators for many years without knowledge of why it was so.

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