Earth is a giant magnet. Its hot liquid centre core contains iron, and
as it moves, it creates an electric current that causes a magnetic field
around the Earth. The Earth has a north and south magnetic pole which is
opposite to the geographic north and south.
a magnetic compasson
the surface of the Earth will point along the magnetic field lines,
towards the north magnetic pole.compass needle behaves like a tiny
magnet and as opposite poles attract south of compass needle(i.e.
geographic south) points to the earth's magnetic north and vice versa.