Conductive core of Earth is as hot as causing freedom of the valence
electrons after which these released electrons distribute themselves toward
the core surface and move along with the rotation of Earth causing
that magnetic field which forms the big magnet inside Earth. This
is a simple account for the geomagnetic field. By accepting this theory
we also be leaded to a conclusion justifying the magnetic inversions
of Earth based on the existence of several changes in axial rotation of
Earth which most probably has had direct influence on expansion of
polar ice on one hemisphere and a permanent day on the other hemisphere
both causing extinction of species (including dinosaurs). Based
on the presented discussions a practical way for direct determination
of ionization energies of different elements is proposed.