You are presented with the question "what can form canyons?" and the following answer choices: 
- spring
 - storms
 - dams
 - mines
 - salmon
 - two
 - rain
 - cut

Now knowing that most canyons are formed by flowing rivers through erosion over long periods of time and canyon Lake Canyon lake was formed by dams on the Salt River, choose the best answer.


 

   dams      