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

Fact 2: Weathering and erosion continue to shape it today.

Given the two facts above, answer the question "Weathering causes what to become deeper and wider?" with the following options: 
- a landslide
 - Sediment
 - a mountain
 - a volcano
 - soils
 - rock
 - flooding
 - a river


 

        a river 