Fact 1: Temperature changing can cause phase changes.

Fact 2: Global warming is the change of the Earth's temperature.

Given the two facts above, answer the question "What is an example of a phase change?" with the following options: 
- flow of electrons
 - Deoxyribonucleicacid
 - chemical reaction
 - dormant state
 - Global warming
 - It remains dormant
 - bullfrogs
 - swamp vegetation


 

     Global warming    