35 kilometers
Continental crust is much thicker than oceanic crust. It is 35 kilometers 22 miles thick on average, but it varies a lot. Continental crust is made up of many different rocks. All three major rock types igneous, metamorphic, and sedimentary are found in the crust. On average, continental crust is much less dense 2.7 g/cm3 than oceanic crust. Since it is less dense, it rises higher above the mantle than oceanic crust.