Question

what is 'SIAL' layer?

Answer 1

In geology, the term 'sial' refers to the composition of the upper layer of the Earth's crust, namely 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.

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Answer 2

Sial layer is one of the core layer in the Earth's crust. It is one of the most important phase in the term of geology.

The crust which is the outermost layer of the earth is divided into two basic layers : one of the layers is Sial and another is sima. Sial is known as the ocean crust of the earth and the Sima is known as the continental crust of the earth.

Sial layer is two hundred million years old and the Sima layer is three thousand six hundred years old. It has depth upto fourty kilometres Below the surface of the earth.