You are presented with the question "what can mountain barriers influence?" and the following answer choices: 
- erosion
 - social media
 - population movement
 - watershed
 - local weather
 - gravity
 - Animal survival
 - Mount Everest

Now knowing that the movement of an air mass over Earth 's surface causes local weather changes and air mass movements are also influenced by mountain barriers, choose the best answer.


 

     local weather    