Okay please note I'm not trying to de-rail here - but could the singular land mass have been caused (eventually after everything calmed down) by the second body impact that is believed to have caused the moon? i.e. the added mass/possibly added water ended up meaning that 1/3rd of the earth was above water. had it not occurred we may have had more water and none of the surface would be land? hmmm.

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---"Why do things have to suck so bad?" a friend once asked me.
"Because space is a vacuum and that's a lot of suck." I replied.
(Actual quote)---