Fact 1: Rocks interacting with wind over long periods of time causes weathering.

Fact 2: Most sands are weathered fragments of quartz.

Given the two facts above, answer the question "What interacting with wind over long periods of time results in sand?" with the following options: 
- rocks
 - soils
 - metal
 - rivers
 - wood
 - deserts
 - erosion
 - water


 

 rocks        