Give the explanation to the following diagram.

a. Country rock producing regional magnetism b. Topsoil producing background magnetism с. Deeply buried ores d. Ores just below the surface  

Make a presentation on the topic MAGNETIC EXPLORATION.

Use the following plan.

A Title page

B Content page

C. General overview of magnetic field and magnetism (magnetic methods,

magnetic field, magnetism)

D. Magnetic measurements (accuracy, instruments, corrections)

E. Magnetic survey result interpretation (results presentation, types of

interpretation)

F. Conclusion

Answer all the possible questions concerning magnetic exploration.

Work in groups. Think over, give your idea and justify your opinion.

1. Is the Earth a magnet?

2. How does the core of the Earth generate a magnetic field?

3. Why do models and chart of a geomagnetic field need to be periodically updated?

4. Is it true that the magnetic field occasionally reverses its polarity? What causes the magnetic field to reverse its polarity?

5. Could magnetic reversals be caused by meteorite or cometary impacts? Could reversals be caused by melting of the polar ice caps or some sort of planetary alignment?

6. The strength of the magnetic field has been decreasing lately, does this mean that we are about to have a reversal?

7. Could the mass extinctions observed in the paleontological record be correlated with magnetic reversals?

8. Are variations in the geomagnetic field somehow associated with earthquakes or vice versa?

9. Does the Earth’s magnetic field affect human health?

10. Do animals use the magnetic field for orientation?

11. What is a magnetic storm? What are the hazardous effects of magnetic storms? What are Auroras?

12. Why do we measure the magnetic field at the Earth’s surface? Wouldn’t satellites be better suited for space-weather studies?

Comment on the following statements.

a.“Magnetism, as you recall from physics class, is a powerful force that causes certain items to be attracted to refrigerators.” Dave Barry

b. “The essential element in personal magnetism is a consuming sincerity - an overwhelming faith in the importance of the work one has to do.” Bruce Barton

c. “To speak, therefore, of an electric current in the nerves, is to use quite as symbolic an expression as if we compared the action of the nervous principle with light or magnetism.” Johannes P. Muller

d. “We have people who are healers and those who posses a certain animal magnetism.” Julian May

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