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      Question

      The “sial” layer of the crust is rich in:

      A Silica and Magnesium Correct Answer Incorrect Answer
      B Silica and Aluminum Correct Answer Incorrect Answer
      C Iron and Nickel Correct Answer Incorrect Answer
      D Calcium and Sodium Correct Answer Incorrect Answer
      E Oxygen and Hydrogen Correct Answer Incorrect Answer

      Solution

      Sial (Si + Al) refers to the upper crust, while sima (Si + Mg) is the lower layer.  

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