What is the best estimate of the densities of the various layers of the Earth? Estimates vary, but some approximate values should be as follows (in grams per cubic centimeter): Continental Crust:    2.7 to 3.0 Oceanic Crust:        3.0 to 3.3 Mantle (silicates):   3.3 to 5.7 (increasing with depth?) Outer Core (liquid):  9.9 to 12.2 Inner Core (solid):  12.6 to 13.0