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Originally Posted by aurora
...It may also be that the Earth's crust was the right composition for plate tectonics only after the Mar's size impactor formed our Moon. I have seen that proposed as well.
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Pretty logical. The idea is that most of the crust was blasted away which formed the Moon. This thinner crust allows for much more dynamics like land above water for one. More
here
[Edit. The "thinner" idea may, or may not, be a good one as it is just something that comes to mind. Ocean basins created appears to be the main benefit as water had a place to go so land would emerge.]