Fact 1: Uneven heating of the Earth 's surface cause wind.

Fact 2: Hurricanes are made of wind.

Given the two facts above, answer the question "What causes hurricanes on the Earth's surface?" with the following options: 
- uneven heating
 - volcanoes
 - hurricanes
 - Physical weathering
 - It gets heated up
 - Water expanding
 - even heat
 - Greenhouse gases


 

 uneven heating        