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      Question

      The "sial" portion of the Earth’s crust is

      characterized by a high concentration of:
      A Silica and Magnesium Correct Answer Incorrect Answer
      B Iron and Nickel Correct Answer Incorrect Answer
      C Silica and Aluminum Correct Answer Incorrect Answer
      D Calcium and Sodium Correct Answer Incorrect Answer

      Solution

      The term "Sial" is a combination of the chemical symbols for Silicon (Si) and Aluminum (Al). It describes the composition of the upper continental crust.

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