Respuesta :

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.

Answer:

SiAl are the rocks that are rich in silican and aluminium.

Explanation:

SiAl is a geological term that refers to the composition of silica and aluminium on the upper layer of the earth's crust. The SiAl ( silica and aluminium) elements have less density than the other minerals of the earth's crust.

SiAl is around 25Km thick from the surface and thin near the ocean floor. The rocks of SiAl layer are known as felsic.

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