You are presented with the question "What sometimes falls as rain?" and the following answer choices: 
- Water vapor
 - Winter
 - trees
 - Metling snow
 - earth
 - soil
 - flooding
 - streams.

Now knowing that clouds are formed by water vapor rising into colder regions of the atmosphere and condensing and eventually, the drops fall out of the cloud in the form of rain, choose the best answer.


 

 Water vapor        