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

Fact 2: Water is made up of H2O molecules.

Given the two facts above, answer the question "what type of vapor cooling causes that vapor to condense?" with the following options: 
- Dew
 - CO 2
 - CFCs
 - rain
 - SO2
 - H20
 - NaCl
 - h2o


 

        h2o 