The percentage of argon in the atmosphere is:
Correct answer: C. 0.90%
- A. About 1%
- B. 0.35%
- C. 0.90%
- D. 3%
Explanation
Argon makes up approximately 0.9% of the atmosphere, commonly given as about 0.93% by volume. Thus 0.90% is the more precise option than the broad ‘about 1%’ alternative.
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