Calamities on the Earth occur Cyclically - every 6,500 and 13,000 years. We are fast approaching the next one. These events scour nearly all traces of human civilization from the face of the earth. So why - IF these cycles are unavoidable - do many ancient civilizations seem to be trying to warn us?
(sacredgeometryinternational.com)
The Adam and Eve Story - The History of Cataclysms by Chan Thomas. Apparently CIA banned the book, but who knows. Good read and easy to understand.
https://www.goodreads.com/author/show/3340457.Chan_Thomas