Fact 1: Wind and rain cause erosion.

Fact 2: Second to the storm surge are wind and rains.

Given the two facts above, answer the question "What causes erosion?" with the following options: 
- rainfall
 - vehicles
 - light snow
 - storm surges
 - fair weather
 - ice wedging
 - cloudy skies
 - a hydraulic system


 

    storm surges     