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. Given these facts, the deposition of sediment at the mouth of a river by water fanning out is called by what name among the following options:
- unidirectional
 - Sediment
 - Calcium carbonate
 - patch reefs
 - A Greek letter
 - barrel-shaped
 - swamp vegetation
 - flooding


 

     A Greek letter    