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      Question

      Feldspar minerals that weather easily tend to be high

      in:
      A K (Potassium) Correct Answer Incorrect Answer
      B Na (Sodium) Correct Answer Incorrect Answer
      C Ca (Calcium) Correct Answer Incorrect Answer
      D P (Phosphorus) Correct Answer Incorrect Answer

      Solution

      Calcium-rich plagioclase feldspars are generally less stable at the Earth's surface than potassium-rich feldspars. Consequently, they undergo chemical weathering much faster when exposed to moisture.

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