Fact 1: Sand dunes are formed by the wind transporting and depositing sand.

Fact 2: Wind erosion is the movement and deposition of soil particles by wind.

Given the two facts above, answer the question "What can be caused by wind erosion?" with the following options: 
- Water expanding
 - Pollution
 - Sand dunes
 - an object
 - deforestation
 - flooding
 - patch reefs
 - detritus


 

   Sand dunes      