Fact 1: Erosion causes a river to become deeper and wider.

Fact 2: Water erosion has similar consequences as wind erosion.

Given the two facts above, answer the question "What can make a river deepen and widen?" with the following options: 
- birds
 - sunlight
 - Sediment
 - wind and water
 - rainfall
 - flooding
 - weeds
 - arteries


 

    wind and water     