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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.
On the other hand, continental crust remains where it is for billions of years and it is much older than oceanic crust. Composition of oceanic crust. Oceanic crust is made up of several layers with the topmost layer being just 500 meters thick. This is made up of basaltic rocks in the shape of pillows and sheets. The lower layer of oceanic crust is made up of two sub-layers that cover a thickness of 4.5 kilometers.