How waterfalls are useful?

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6. Why do waterfalls never run out of water?
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Tags

1. #useful
2. #electricity
3. #strong
4. #beautify
5. #irrigation
6. #number
7. #produced
8. #power
9. #currents
10. #hydroelectric
11. #waterfalls
12. #pressure
13. #water
14. #landscape
15. #purposes
16. #domestic
17. #produce
18. #turbines
19. #running