You are presented with the question "What causes ice storms?" and the following answer choices: 
- colder weather
 - Fossil fuels
 - heat energy
 - a hydraulic system
 - Water expanding
 - salt and water.
 - erosion
 - less water

Now knowing that gases released during the use of fossil fuels causes global warming and global warming causes ice storms, choose the best answer.


 

  Fossil fuels       