Fact 1: Condensation causes clouds to form.

Fact 2: Fog is a cloud that forms on the ground.

Given the two facts above, answer the question "What is a cause of fog?" with the following options: 
- evaporation
 - heating liquids
 - condensation
 - transpiration
 - scattered light
 - Pollution
 - Water expanding
 - droplets of lemonade


 

   condensation      