The oceanic crust is created as magma rises upwards to fill the spaces between diverging tectonic plates under the surface of the earth and is consumed in subduction zones below. It is comparatively pretty new to the continental crust, with a mean age of 60 million years, and is thin, averaging 6.5 to 7 km in thickness. The oceanic crust consists of almost exclusively extrusive basalt, which is a type of rock and its intrusive correspondents.
Continental crust is majorly composed of granites in composition and, with a density of about 2.7 to 3 grams per cubic cm, is comparatively lighter than oceanic crust in its composition and has a density of about 2.9 to 3 grams per cubic cm.
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