You are presented with the question "What can make a river deepen and widen?" and the following answer choices: 
- birds
 - sunlight
 - Sediment
 - wind and water
 - rainfall
 - flooding
 - weeds
 - arteries

Now knowing that erosion causes a river to become deeper and wider and water erosion has similar consequences as wind erosion, choose the best answer.


 

    wind and water     