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My question is related to a former question about the Earth's early crust. I would like to understand HOW the crust that seems to have been mafic during the Hadean, changed into the other more felsic compositions later. Why this happened? How did it arrive to being so well-separated with the felsic crust under the oceans (I understand that felsic is buoyant and it does not get dense enough, so it can't be under the oceans) But HOW? and WHY?

Thank you!

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    $\begingroup$ At the moment the question is too broad in my opinion. Read in this order: one, two, and three. After that you will have a better idea of how this works, and if you have any questions remaining you can ask a more specific one that will help us help you. $\endgroup$
    – Gimelist
    Aug 5, 2016 at 0:24

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