Fact 1: Erosion causes deposition.

Fact 2: Silica sand is primarily mined from sandstone deposits.

Given the two facts above, answer the question "What forms silica sand?" with the following options: 
- Sediment
 - loose soil
 - sunlight
 - fire
 - soft soil
 - erosion
 - gasoline
 - rocks


 

      erosion   