... the magnetic poles are due to the rotation of the iron core inside our planet. Rotation of magnetic elements induces currents which in turn induce electromagnetic fields (more complex than that, but just for the sake of simplicity).
The actual geographical poles are due to the axis of rotation of the earth (i.e. the spin which gives us the 24 hr day).
Geographic and magnetic poles do not coincide, among other things because of the fact that the earth actually "wobbles" during its rotation around the sun. Also our orbit is elliptic, not circular. Interactions with the solar wind and gravity. Among other things...
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