You are presented with the question "Deltas are formed by deposition of what at the mouth of a river by water fanning out?" and the following answer choices: 
- air
 - water
 - salt
 - ice
 - soils
 - sand
 - rocks
 - barrel

Now knowing that adelta is formed by deposition of sediment at the mouth of a river by water fanning out and sand is an example of a clastic sediment, choose the best answer.


 

      sand   