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

Fact 2: Canyon Lake Canyon lake was formed by dams on the Salt River.

Given the two facts above, answer the question "what can form canyons?" with the following options: 
- spring
 - storms
 - dams
 - mines
 - salmon
 - two
 - rain
 - cut


 

   dams      