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- Created 2012-03-13
is the layer of
which forms the
s and the areas of shallow seabed close to their shores, known as
. This layer is sometimes called
because there is more
, bulk composition, which lies in contrast to the
because of the
ic rock. (Based on the change in velocity of
s, it is believed that at a certain depth sial becomes close in its physical properties to sima. This line is called the
Consisting mostly of granitic rock, continental crust has a density of about 2.7 g/cm
and is less
than the material of the Earth's
(density of about 3.3 g/cm
), which consists of mafic rock. Continental crust is also less dense than oceanic crust (density of about 2.9 g/cm
), though it is considerably thicker; mostly 25 to 70 km versus the average oceanic thickness of around 7–10 km.
About 40% of the Earth's surface is now overlaid by continental crust.
Continental crust makes up about 70% of the volume of
from Wikipedia (last updated: 19 May), licensed under
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Average composition of Continental Crust
Evolution of the Continental Crust
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