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Discussion :: Chemistry

  1. Major portion of the earth’s crust is mainly constituted by

    2. A.

     Oxygen and Iron
    B.

     Oxygen and Silicon
    C.

     Silicon and Iron
    D.

     Silicon and Aluminium

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    Answer : Option B

    Explanation :

    Oxygen is the most abundant element in the earth’s crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth’s crust.

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