You are presented with the question "be prepared for clear, cold days after what" and the following answer choices: 
- global warming
 - spring
 - droughts
 - heat waves
 - thunderstorms
 - Dehydration
 - Greenhouse gases
 - Animal survival

Now knowing that cold fronts cause thunderstorms as they pass by and after the cold front passes, be prepared for clear, cold days ahead, choose the best answer.


 

     thunderstorms    