The upper part of the earth's crust is called SIAL because ___________.

It is rich in sodium and aluminium

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It is rich in silica and aluminium

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It is rich in scandium and arsenic

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It is rich in sulphur and argon

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Solution

The correct option is C It is rich in silica and aluminium
The outer or upper layer of the earth's crust is mostly found under the continent. Silica and aluminum are abundantly found in this layer therefore it is popularly known as SIAL. The average density of the layer is 2.75 to 2.90 and the average thickness is 8 to 100 km.

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