Fact 1: The surface of a beach is formed by mechanical weathering.

Fact 2: Beaches and Sand Dunes Dunes are accumulations of sand blown from the beach by the wind.

Given the two facts above, answer the question "what makes sand formations?" with the following options: 
- potash
 - wind
 - fibers
 - fish
 - Rain
 - sea
 - soils
 - coral


 

  wind       