Fact 1: Asandbar is formed by water moving sediment downstream.

Fact 2: Shoreline currents carrying sediments build sandbars and spits across bay mouths.

Given the two facts above, answer the question "What moves sediment downstream?" with the following options: 
- streams.
 - High winds
 - streams
 - rivers
 - Fish
 - Tourists
 - Currents
 - flooding


 

       Currents  