You are presented with the question "The deposition of sediment at the mouth of a river by water fanning out is called by what name?" and the following answer choices: 
- unidirectional
 - Sediment
 - Calcium carbonate
 - patch reefs
 - A Greek letter
 - barrel-shaped
 - swamp vegetation
 - flooding

Now knowing that adelta is formed by deposition of sediment at the mouth of a river by water fanning out and delta Greek symbol, looks like a triangle, choose the best answer.


 

     A Greek letter    