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

Fact 2: Finally, the pattern of tropical wind and ocean circulation is a key element of global circulation.

Given the two facts above, answer the question "Unequal heating of the Earth's surface by the Sun causes ocean circulation and what?" with the following options: 
- Energy.
 - climate
 - raincoats
 - The atmosphere
 - tropical wind
 - freezing rain
 - pouring down
 - to move people


 

     tropical wind    