Fact 1: Boiling means change from a liquid into a gas by adding heat energy.

Fact 2: For a smoother flavor, bring soup to a boil.

Given the two facts above, answer the question "Changing from liquid to gas by adding heat energy occurs during what?" with the following options: 
- freezing water
 - Dehydration
 - reading books
 - Evaporation
 - prolonged thirst
 - breathing air
 - cooking soup
 - rain or sun shine


 

       cooking soup  