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"After removal of the dipole field anomalies, the variations in the field (few hundreds of nT) are due to changes in the magnetic properties of the crustal rocks themselves.
Hot colours (reds) indicate high values; cold colours (blues) indicate low or negative values of the magnetic field strength."
So for eg. the Atlantic is striped as the plates are moving apart here and creating new rock. The earth's magnetic fields reverse periodically and this is recorded in the rock at the time it forms.
READ here
also
IS THE EARTH PREPARING TO FLIP?
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