Fact 1: Water vapor cooling causes that water vapor to condense.

Fact 2: Clouds form by the condensation of water vapor.

Given the two facts above, answer the question "What can form when water vapor cools?" with the following options: 
- Chimneys
 - Evaporation
 - chemicals
 - streams
 - Wind
 - Organic nutrients
 - Clouds
 - mildew


 

       Clouds  