The likelihood of such mammoth earth changes seems to be very remote. If we look at recorded history we do not discover many such events. Even within the fossil record there is not much evidence for such vast earth changes being very likely, as such events take place with millions of years in between. The geological records in the Grand Canyon show that over a 1.7 billion year period seas covered the land there eighteen different times. That means that it is almost one hundred million years between such episodes.
Smaller changes do occur more frequently.
There is the widespread somewhat mythological story of the Great Flood, and there is a fossil record, a layer of mud, of a great flood or perhaps series of floods having taken place in Mesopotamia - cause unknown. As so much of the human race passed through this region, this flood in Mesopotamia is the probable source of the story, and indeed such an event probably did take place. The fossil and geological record does not, however, record any large permanent earth change to have taken place from this event. There was a period within recorded history when there were major earth changes. From seven thousand to about thirty-five hundred years ago the climate of the earth was very different.