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Rockhound. Oceanic crust is predominately made of basaltic rock with a thin layer of sedimentary rock on top. Continental crust is predominately made of granitic rock, with a thin layer of sedimentary rock covering much of the visible surface. Best Pre-made Pizza Crust Brands While homemade pizza crust is always best, it is not always the easiest or most practical option for your busy life. 2  If you do not want to spend tons of time kneading dough aâ¦. 3  Easy Vegan Desserts Following a vegan lifestyle does not mean you have to deprive yourself of sweets.
Making the world better, one answer at a time. Its made up of both. Oceanic crust is mostly mafic magma (basalt) and continental crust is mafic and felsic. The lithosphere also contains the upper portion of the upper mantle which is mostly mafic. The earths crust is 60% Si02 (silicates). Felsic rocks are much more silicate heavy than mafic. So one would assume that the crust is more felsic than mafic. That's just my conceptual thought process so don't take me on my word.