Our dirty snowball

It is assumed that to days continents have separated from an earlier super-continents: https://en.wikipedia.org/wiki/Supercontinent

Was this super-continent an island on one side of the earth? This would cause great instability in the earth's rotation. Can it be that the earth at that time was smaller at that time and and this super-continent covered all the earth?



What happens next? The solar system is moving trough the interstellar dust and the debris of exploded stars, and absorbs material on it way. Like a snowball rolling in the snow it catches up more and more stuff as it slowly increases causing the original super-continent to break up to what the earth looks like today