Q. Which of the following layer of the earth is termed as Sial?
Answer: Crust
Notes: Outermost layer of the earth- crust is also known as Sial because major constituent elements of crust are silica (Si) and Aluminium (Al). Mantle is also known as Sima because major constituent elements of mantle are magnesium and silicon. Innermost layer of the earth- core is also known as Nife because core is mainly composed of the iron (fe) and nickel (Ni).

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