If you bring a north pole and a south pole together, they will attract. Earth's core contains liquid iron which moves around. Iron is magnetic so the liquid iron causes Earth to have a magnetic field.

The electrically conductive liquid iron is in constant motion ... and more complex than that of a regular bar magnet, the magnetic south pole — the point in the Southern Hemisphere where ...

The movement of the molten, electrically conductive iron gives rise to our ... While the magnetic north pole is on the move, the south magnetic pole is comparatively static. It’s moving ...