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

  • question_answer What does the term 'sial' refer to?

    A)  Earth's surface layer

    B)  The core part of the earth

    C)  Ocean bottom rocks

    D)  A rock which is rich in calcium

    Correct Answer: A

    Solution :

     Sial refers to the upper layer of the earth's crust. It is rich in silicon and aluminum.

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