You are presented with the question "What geological form is made by rivers weathering the land over time?" and the following answer choices: 
- mountains
 - plains
 - loose soil
 - soft soil
 - Sediment
 - soils
 - canyons
 - hills

Now knowing that most canyons are formed by flowing rivers through erosion over long periods of time and weather wears down the by erosion, choose the best answer.


 

       canyons  