Fact 1: Sedimentary rocks are formed by deposition.

Fact 2: Soils are sand, clay, and organic deposits.

Given the two facts above, answer the question "What are formed by soil, sand, clay and organic materials?" with the following options: 
- sedimentary rocks
 - loose soil
 - silts
 - swamp vegetation
 - dams
 - fossil fuels
 - coral reef
 - waterways


 

 sedimentary rocks        