You are presented with the question "A sandbar is formed by " and the following answer choices: 
- loose soil
 - magma eruptions
 - wind currents
 - near the shoreline
 - seismic activity
 - natural erosion
 - flooding
 - Physical weathering

Now knowing that asandbar is formed by water moving sediment downstream and some sediment comes from natural erosion, choose the best answer.


 

      natural erosion   