Moderate
Potassium (K) occurs as a constituent of the earth's crust in the proportion of_________?
Correct answer: B. 2.3 %
- A. 23 %
- B. 2.3 %
- C. 17 %
- D. 1.7 %
Explanation
Potassium constitutes about 2.3% of the Earth’s crust by weight. The other percentage choices are much too high for potassium’s crustal abundance.
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