It’s one thing to discuss the probabilities of an Atlantean and a Lemurian civilization, and it’s totally another thing to come up with the reasons both or either were destroyed. Frank Joseph, editor in chief of Acient America magazine, has an interesting opinion of the destruction of Lemuria. The civilization was undone by a comet.
Let’s start with what we “currently” know about this coment known as Encke.
Comet Encke (officially designated 2P/Encke) is a periodic comet, named after Johann Franz Encke, who through laborious study of its orbit and many calculations was able to link multiple observations in 1786. The single most observed comet, Encke’s Comet has been viewed for approximately 50 passes. Already possessing one of the shortest orbital periods (only 3.3 years), its period is further decreasing by up to 2.7 hours per revolution.
Encke’s Comet is thought to be the parent body of the Taurid meteor stream, an annually recurring minor meteor shower which culminates on November 8. Because the orbit of Encke’s Comet is so very well known, it is considered a prime target for an exploratory space probe to investigate.
Let’s back up now a few thousand years, maybe ten of thousands of years.
Some consider the Bronze Age breakup of an originally larger comet of which Comet Encke is a member to be responsible for ancient destruction in the Fertile Crescent, perhaps evidenced by a large (unconfirmed) meteorite crater in Iraq identified as Umm al Biinni lake. More on that at another time.
Specifially, Frank Joseph says, “Encke had a near miss with planet earth in 3100BCE raining down a barrage of debris in a in a firey swath around the world igniting widespead volcanism, earthquakes, and massive tsunamis that wiped out Lemuria.” All of this to say that IF there is a larger Planet X out there, and coming our way in 2012, it would not be a pretty picture.
But, so far, I’m not convinced- just keeping my mind open. 
