Explain what is a Sial in Geography??​

In geology, the term sial refers to the composition of the upper layer of Earth's crust, namely rocks rich in aluminium silicate 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.

Explanation:

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in geology, the term sail refers to the composition of the upper layer of earth crust, namely rocks rich in aluminum silicate minerals.

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