Fact 1: Most canyons are formed by flowing rivers through erosion over long periods of time.

Fact 2: Canyon formed as a consequence of river erosion.

Given the two facts above, answer the question "what does erosion form?" with the following options: 
- valleys
 - Sediment
 - mountains
 - canyons
 - soils
 - hills
 - soft soil
 - loose soil


 

    canyons     