SIAL

Sial

In geology, the sial is the upper layer of the Earth's crust made of rocks rich in silicates and aluminium minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins, but "sial" is a geochemical term rather than a plate tectonic term. As these elements are less dense, they tend to be concentrated in the upper layer of the crust.

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sial

Noun

  1. The rocks rich in silicon and aluminum that form the upper layer of the earth's crust, which lies beneath all continental landmasses.


The above text is a snippet from Wiktionary: sial
and as such is available under the Creative Commons Attribution/Share-Alike License.

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