Read Earth's Shifting Crust by Charles Hapgood; Forward by (the) Albert Einstein. The Einstein forward is available using the "Look Inside" feature at the Amazon link provided here.
ML.NJ
What about the previous glacial/interglacial periods in a regular cycle? (see post #16)
If it is crustal displacement, then what caused it to happen on a very regular interval cycle like this? External forces? Internal forces?