Fact 1: Dew is formed when water vapor condenses over night.

Fact 2: Condensation on roofs at night is common in cooler weather.

Given the two facts above, answer the question "Dew is formed when water vapor is what?" with the following options: 
- uncontrolled
 - smoked outdoors
 - frozen at once
 - major threat to health
 - aqueous solution
 - It gets heated up
 - cooled at night
 - chilled inside


 

       cooled at night  