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

Fact 2: Weather wears down the by erosion.

Given the two facts above, answer the question "What geological form is made by rivers weathering the land over time?" with the following options: 
- mountains
 - plains
 - loose soil
 - soft soil
 - Sediment
 - soils
 - canyons
 - hills


 

       canyons  