You are presented with the question "What forms sedimentary rocks?" and the following answer choices: 
- cracking
 - streams
 - rock
 - soils
 - rivers
 - shells
 - calcite
 - coal

Now knowing that sedimentary rocks are formed by deposition and deltaic deposits are an accumulation of sediment deposited at the mouth of a river, choose the best answer.


 

     rivers    