World In Collision V's Earth Crust Displacement

Perhaps I just come from a strange family, but my father and I hold widely separated views regarding the ending of the last Ice Age, and the global flooding events, volcanic activity etc. which accompanied that era. While my father is a proponent of Immanuel Velikovsky's "Worlds In Collision" theory, aseerting that a large comet impacted the Earth, I myself, am a fervent supporter of Charles Hapgood's "Earth Crust Displacement" theory, which suggests that the massive volume of Ice, which covered North America, pulled the Earth's crust around to displace that mass. Much evidence backs up that theory:

• The rapid freezing of animals in Siberia
• The mystery of Atlantis (could have been Antartica)
• The global mythology of flood events
• Einstein, like me, thought it was a great theory

Of course, it's possible that some combination of both theories actually happened, or neither, but that's the beauty of theories, if no-one can disprove them, then they stand the test of time !