<<The gravitational pull
of all the planets could be big enough to make the earth tip on it's
side causing the poles to move to the equator. This would cause massive
earthquakes, volcano erruptions and floods due to the melting of the
polor ice.
>>
I read about something like this in a book called "Fingerprint of the Gods" By
Graham Hancock. The book is pretty interesting though I don't know how correct
it is.