Fact 1: The movement of an air mass over Earth 's surface causes local weather changes.

Fact 2: Weather affects distribution locally.

Given the two facts above, answer the question "What can affect distribution locally?" with the following options: 
- Movement of an air mass
 - exposure to cold
 - a tree falling
 - dreams
 - deforestation
 - desires
 - forest is destroyed
 - Astrological signs


 

 Movement of an air mass        