In a nutshell the difference in density between
Continental Crust and Oceanic Crust is derived
from their different mineralogical
compositions. Continental Crust is made up of
alkali rich feldspar (K-spar) and quartz, whereas
oceanic crust is made up of Calcium-rich feldspar
(plagioclase) and pyroxene.
In terms of compositions Oceanic Crust is much
richer in dense elements like iron, calcium ,
titanium, and magnesium, whereas the Continental
Crust is made up of light elements like potassium
(K) sodium (Na) and silicon (SI) plus Alumina A.
So, in a nutshell the Continental Crust has a
typical density of 2600 kg per cubic meter (or 2.6
g/cc) whereas the rock making up Oceanic Crust is
called gabbro, and gabbro has a density around
3000 kg/m3 (or 3 g/cc).
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