You are presented with the question "Dew is formed when _ occurs over night" and the following answer choices: 
- cooling
 - imbalanced
 - rain
 - storms
 - warm
 - boiling
 - a solute
 - Joules

Now knowing that dew is formed when water vapor condenses over night and if the cooling is sufficient, water vapor condenses into clouds, choose the best answer.


 

 cooling        