You are presented with the question "what makes sand formations?" and the following answer choices: 
- potash
 - wind
 - fibers
 - fish
 - Rain
 - sea
 - soils
 - coral

Now knowing that the surface of a beach is formed by mechanical weathering and beaches and Sand Dunes Dunes are accumulations of sand blown from the beach by the wind, choose the best answer.


 

  wind       