Being exposed to wind can cause erosion of soil, and soil erosion causes crop yields to decrease. Given these facts, what is a possible negative effect of exposing soil to wind  among the following options:
- It used to be covered by water
 - exposure to cold
 - decrease in crop yields
 - greater food production
 - elimination of harmful pests
 - a tree falling
 - wind power increases
 - Damages them


 

   decrease in crop yields      