Density is responsible for determining how earth materials separate out into interior layers. Density increases with depth, and the average density is roughly 2.7 g/cm3 (the earth's average density is 5.51 g/cm3). The thickness of the crust varies between 5 and 30 kilometers for the oceanic crust and 50 and 70 kilometers for the continental crust.
The crust outer layer is composed of sedimentary material, and beneath it are acidic crystalline, igneous, and metamorphic rocks. Basaltic and ultrabasic rocks make up the crust's lowest stratum. The continents are made up of lighter silicates — silica + aluminium whereas the oceans are made up of heavier silicates
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