Fact 1: Sedimentary rocks are formed by deposition.

Fact 2: Deltaic deposits are an accumulation of sediment deposited at the mouth of a river.

Given the two facts above, answer the question "What forms sedimentary rocks?" with the following options: 
- cracking
 - streams
 - rock
 - soils
 - rivers
 - shells
 - calcite
 - coal


 

     rivers    