Most canyons are formed by flowing rivers through erosion over long periods of time.
Deep gorges and canyons formed by the river are tourist attractions.
Deep gorges are formed by flowing rivers through erosion over long periods of time.
What are formed by flowing rivers through erosion over long periods of time?

1. Sediment
2. soft soil
3. forests
4. deep gorges
5. cloud cover
6. patch reefs
7. big oceans
8. kalenchoes