Q. Clouds usually form when
A) evapouration has warmed the surrounding air
B) air temperature reaches the dew point
C) condensation nuclei have been removed from the air
D) relative humidity is 0%
✔ Correct Answer: air temperature reaches the dew point
Exam Insight
Clouds usually form when warm, moist air rises, expands, and cools, leading to condensation of water vapor into tiny water droplets or ice crystals.