Fact 1: Unequal heating of Earth 's surface by the Sun causes global wind patterns.

Fact 2: Wind is air that is moving across the surface of Earth.

Given the two facts above, answer the question "What does uneven heating of earth's crust cause?" with the following options: 
- force
 - harm
 - Rain
 - Snowstorm
 - cracks
 - Wind
 - Injury
 - Hurricanes


 

      Wind   