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Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning

Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Can you explain the matching magnetic alignments seen south of Iceland (as shown)?

Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning
Transcribed Image Text:Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning
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