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

Now knowing that sedimentary rocks are formed by deposition and soils are sand, clay, and organic deposits, choose the best answer.


 

 sedimentary rocks        