Fact 1: Climate is the average weather in an area over a long period of time.

Fact 2: Weather refers to the circulation of the Earth's atmosphere.

Given the two facts above, answer the question "climate is the average what over a long period of time?" with the following options: 
- Earth's atmosphere circulation
 - By wind and rain
 - heat and pressure
 - bacteria
 - Temperature changing
 - Earth's density
 - characteristics
 - gravity


 

 Earth's atmosphere circulation        