Why is a waterfall only a temporary feature?

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Tags

1. #slopes
2. #terrain
3. #geology
4. #mountainous
5. #waterfalls
6. #general
7. #steeper
8. #eventually
9. #temporary
10. #waterfall
11. #occurrence
12. #create
13. #increases
14. #scale
15. #feature
16. #erosion
17. #factors
18. #river
19. #within