Origin
There is little evidence of continental crust prior to 3.5 bya, and there was relatively rapid development on shield areas consisting of continental crust between 3.0 and 2.5 bya. All continental crust ultimately derives from the fractional differentiation of oceanic crust over many eons. This process has been and continues today primarily as a result of the volcanism associated with subduction.
Read more about this topic: Continental Crust
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“The real, then, is that which, sooner or later, information and reasoning would finally result in, and which is therefore independent of the vagaries of me and you. Thus, the very origin of the conception of reality shows that this conception essentially involves the notion of a COMMUNITY, without definite limits, and capable of a definite increase of knowledge.”
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