Adelta is formed by deposition of sediment at the mouth of a river by water fanning out, and when the river slows, it drops the sediment in a wide fan, a delta. Given these facts, sediment is dropped at the mouth of a river by water when what happens among the following options:
- Destroy bridges
 - erosion
 - global warming
 - rivers slow
 - flooding
 - contamination
 - massive damage
 - storms


 

    rivers slow     