You are presented with the question "What are formed by flowing rivers through erosion over long periods of time?" and the following answer choices: 
- Sediment
 - soft soil
 - forests
 - deep gorges
 - cloud cover
 - patch reefs
 - big oceans
 - kalenchoes

Now knowing that most canyons are formed by flowing rivers through erosion over long periods of time and deep gorges and canyons formed by the river are tourist attractions, choose the best answer.


 

    deep gorges     