Polar drift
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Polar drift is a geological phenomenon caused by variations in the flow of molten iron (magma) in Earth's outer core, resulting in changes in the orientation of Earth's magnetic field, and hence the position of the magnetic north pole.
The magnetic north pole is approximately 965 kilometers from the geographic north pole. The pole drifts considerably each day, and moves about 10 to 40km per year as a result of this phenomenon.