there will be catastrophy...
why moon will disappear? is it because of the magnetic field of earth is weakining? then human also will die...
if the moon disappear , meaning that the moon is moving to other area in solar system.. it will not moving in the orbit anymore(will moving just like meteor = attrack to other planet due to stronger magnetic field)...this will be worst as two huge object hitting each other... = will be explotion...
and for sure ...our earth magnetic field has records of reverse-pole session in past billion of years ( recorded in basaltic rock at the continental drift zone)