You are presented with the quiz "Being exposed to wind can cause " 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "being exposed to wind can cause erosion of soil" and "desertifcation can be caused by overgrazing, soil erosion, prolonged drought, or climate change". 

So, what's the best answer to the question?


 

       Desertification    