The inner core of the earth is made of molten iron due to the extreme heat the electrons have been removed from their higher orbit and ionized. Ionization is the remove (or) escaping of electrons of the atoms from their orbit. The electrons thus ionized rising, flee towards the surface of the earth from south pole to the North pole distinctly paths on the Earth's surface and stirs the electrons in the higher orbit of the atoms of Soiled, Oceans and atmosphere causing a great magnetic field. Those stirred electrons which cause the magnetic field are called Dominating Electrons.