Fact 1: Cold fronts cause thunderstorms as they pass by.

Fact 2: Thunderstorms Thunderstorms give birth to tornadoes.

Given the two facts above, answer the question "Cold fronts can give birth to what?" with the following options: 
- rays or beams
 - heat energy
 - warm weather
 - high pressure
 - fur and fat
 - influenza
 - tornadoes
 - rising tides


 

       tornadoes  