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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