When the moon appears to be dark in a clear sky, it is at which stage?
  1. Full moon
  2. Waxing moon
  3. Waning crescent
  4. New moon
Explanation
Answer: D - The moon is considered to be a new moon when it appears completely dark in a clear sky. A new moon has gone through the waning crescent stage until no crescent is visible and it is completely dark. After a new moon, the moon “waxes” again, becoming fuller each night until the cycle completes itself.
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