Magnetic_Lecture - Magnetic lines of force Origin of Earth...

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Unformatted text preview: Magnetic lines of force Origin of Earth magnetism Reading the magnetic record in rocks Magnetic reversals Chapter 21: Earth Magnetism Next Lecture: Finish Chapter 21 Magnetic lines of force Origin of Earth magnetism Reading the magnetic record in rocks Magnetic reversals Chapter 21: Earth Magnetism Next Lecture: Finish Chapter 21 Needles, which are themselves magnets, are aligned with the earths magnetic lines of force. The needle has a north-seeking end (black) and south-seeking end (white). No matter how complexly shaped, every magnetic line of force is a closed loop. Lines may lie both within the earth and occupy the space above the earth. Magnetic lines of force Origin of Earth magnetism Reading the magnetic record in rocks Magnetic reversals Chapter 21: Earth Magnetism Next Lecture: Finish Chapter 21 In the earths outer core, motions of liquid Fe-Ni generate the magnetic fielda poorly understood phenomenon. Lines of force act like elastic bands that can become stretched and tangled (but not broken). Magnetic lines of force...
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This note was uploaded on 09/14/2009 for the course GEO 401 taught by Professor Lassiter during the Spring '08 term at University of Texas at Austin.

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Magnetic_Lecture - Magnetic lines of force Origin of Earth...

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