The layer of the Crust has high concentration of :

Options :
  1. Aluminium & Potassium
  2. Sulphur & Nitrogen
  3. Silica & Aluminium
  4. Hydrogen & Oxygen
Answer and Explanation :-

Answer: Option 3

Explanation:

The Crust part of the earth is rich in Silica & Aluminium. The layer is also called SIAL and the average density of this layer is 2.7.

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