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UPSC Geography The origin and evolution of the earth Question Bank Universe / Sun / Planets / Earth

  • question_answer
    Which of the following elements are found in highest and lowest quantities respectively in the crust of the earth? [CDS 2016-II]

    A)  Oxygen and silicon

    B)  Calcium and sodium

    C)  Sodium and magnesium

    D)  Oxygen and magnesium

    Correct Answer: D

    Solution :

     Elements in the Earth's crust - Oxygen =47%, Silicon = 28%, Calcium = 3.5%, Sodium = 3% and Magnesium = 2%


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