You are presented with the question "Boundaries between air masses can cause" and the following answer choices: 
- Dehydration
 - friction
 - rain or sun shine
 - permineralization
 - heat energy
 - Pollution
 - Movement
 - thunderstorms

Now knowing that cold fronts cause thunderstorms as they pass by and fronts boundaries between air masses Fronts are boundaries between air masses , choose the best answer.


 

        thunderstorms 