Adelta is formed by deposition of sediment at the mouth of a river by water fanning out, and deltas are usually fan-shaped deposits of sediment that form where currents slow at a river's mouth. Given these facts, fan-shaped deposits of sediment form where among the following options:
- mouth of rivers
 - bottom of oceans
 - flooding
 - near the shoreline
 - the Great Barrier Reef
 - entrance of puddles
 - unidirectional
 - top of canyons


 

 mouth of rivers        