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Earth's Inconstant Magnetic Field

Earth's Inconstant Magnetic Field

This National Aeronautics and Space Administration site describes long-term changes in Earth's magnetic field, and how magnetic stripes in the Atlantic seafloor provide evidence for reversals of this field. The site presents a model of Earth's interior that helps explain how Earth's magnetic field is generated and how the reversals occur. A computer-generated image shows the complicated magnetic field in-between reversals.
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