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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.
Long story short - continental crust is thicker because is less dense, and it is less dense because it's composed mostly of quartz and feldspars, both having density around 2.6 g/cm3, whereas oceanic crust is made up by slightly denser Ca feldspar called plagioclase as well as pyroxenes and olivine, both having density above 3 g/dm3.