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So, this is based on that Pangea theory.  What do you supposed caused the breakup?  I mean, most likely the Flood, but how did that work, and by what mechanisms?  

This is explained by the theory of Cataclysmic Geology. Read the work of the much-censored books by Immanuel Velikovsky (whose books were attacked and censored PRIOR to their publication).

Immanuel Velikovsky (1895-1979) was a controversial author of several books suggesting a radical interpretation of history. In his best-selling book, Worlds in Collision (1950), he argues that the Earth and other planets, had been subject to cosmic catastrophes in historical times, that had been recorded in the oral traditions, myths and legends of the peoples of the world. His 1956 book Earth in Upheaval describes geological evidence that he says supports the idea of global catastrophes in prehistorical and historical times.
In Ages in Chaos (1952), Velikovsky writes of parallels he found between biblical and Egyptian history from the Exodus to the early Divided Monarchy era, that initiated a debate on the chronologies of ancient history, and three more books, Oedipus and Akhnaton (1960), Peoples of the Sea (1977), and Ramses II and His Time (1978).
Published posthumously, in Mankind in Amnesia (1982) Velikovsky draws on his training as a psychiatrist and psychoanalyst to propose his theory of collective amnesia to explains the inability of people to look at the overwhelming evidence of global catastrophes.
The Velikovsky Affair
The controversy surrounding Velikovsky’s work is often referred to as “The Velikovsky Affair” after the 1966 book of the same name by Alfred de Grazia. Velikovsky’s own point of view of the controversy is described in his book Stargazers and Gravediggers (1983). C.J. Ransom also recounted the saga in The Age of Velikovsky (1976), Shane Mage in Velikovsky and his Critics (1978), and Henry Bauer in Beyond Velikovsky (1984). Two television programmes have included Henry Zemel‘s docuмentary Velikovsky: The Bonds of the Past (1972), and the BBC program, Horizon: Worlds in Collision (1972).
Criticism
Criticism towards Velikovsky’s work has been extensive, including Harvard astronomers Harlow Shapley and Cecilia Payne-Gaposchkin, who succeeded in forcing publisher Macmillan to transfer Worlds in Collision to Doubleday. In 1974 the American Association for the Advancement of Science held a meeting “Velikovsky’s Challenge to Science“, which included criticisms from Peter Huber, David Morrison, J. Derral Mulholland, Carl Sagan and Norman Storer, published in the book, Scientists Confront Velikovsky (1977). Other critics include Isaac Asimov, Martin Gardner, Bob Forrest in his six-volume book, Velikovsky’s Sources (1981), Stephen Jay Gould, and more recently, C. Leroy Ellenberger and Phil Plait.
Appraisal
Over the years, a number of publications, organisations and people have taken a sympathetic look at Velikovsky’s work, including the publications Pensée (1972-1975), Kronos (1975-1988), Catastrophism and Ancient History Journal (1978-1993)), Aeon (since 1988), The Velikovskian (since 1993), and the British organisation, the Society for Interdisciplinary Studies (1974 to present), and authors such as Alfred de Grazia, Lynn E. Rose, Lewis M. Greenberg, Warner B. Sizemore, Ralph Juergens, Irving Wolfe, Earl R. Milton, C.J. Ransom , Fred Jueneman, Dwardu Cardona, Ev Cochrane, Charles Ginenthal, David Talbott and Wal Thornhill. A Center for Velikovskian and Interdisciplinary Studies was founded in 1975. In 1973, the University of Lethbridge offered Velikovsky an honorary degree of Doctor of Arts and Science, that was conferred in the Spring of 1974.

This is a very uncivil way to talk. Can you please try to show at least basic courtesy when you speak to others on the internet.

You might want to try following your own advice, Yeti. (i.e. calling someone a "heretic" because you are not familiar with the Bible).