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

Fact 2: Lightning Occurs with ALL thunderstorms.

Given the two facts above, answer the question "Cold fronts cause what as they pass by?" with the following options: 
- lightning
 - flooding
 - vaporization
 - bleaching
 - Fog is formed
 - solar coronas
 - eclipses
 - rainfall


 

 lightning        