All their descendants? I don't remember that ever happening from either a religious or secular point of view. But how did Noah and later get there? Well, I'm not entirely sure on this one. In a worldwide flood, that would be no problem, but I'm not quite as literal in my interpretation of the Bible as many are, and "that strict Mormon Church that tells everyone what to believe" actually allows for a great deal of leeway in interpretation. In other words, I believe a flood did happen, but I believe it was far more local. Could it have been migration? Yes, it could have been. Could it have been continental drift? Interestingly, the Bible makes some references to a Pangea like state (Gen. 1:9, 10:25), but that doesn't seem to fit with accepted theories of plate tectonics and the millions of years it takes to drift. I would probably have to side with migration (heck, it's amazing how far ancient people were capable of traveling, even without landbridges to get them to another location). To me, however, I don't claim to know all the answers. Some answers come later, some not at all in this life. But faith is not without evidence. Sometimes some tangible evidence is given to assist faith, while other evidence is withheld to promote faith.