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Unformatted text preview: that there is considerable skepticism - shared by me! - about the reality of personal auras.) As we will learn, the Earth's magnetic field has an importance which far transcends the merely diagnostic, however: the magnetic field, and especially the way in which it periodically changes, turns out to provide a critical link in developing our understanding of the way in which Continental Drift works. (See pages 400-404 of your text.) Ultrasound: The very best diagnostic tool for geophysical studies turns out to be one which is analogous to the use of ultrasound on the human body. But this is so important that it deserves a section on its own....
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- Spring '10