Why do waterfalls not run out of water?

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  2. #massive
  3. #never
  4. #rivers
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  6. #water
  7. #falls
  8. #contain
  9. #drops
  10. #great
  11. #amount
  12. #niagara
  13. #which
  14. #because
  15. #elevation
  16. #anytime
  17. #connects
  18. #question
  19. #answer
  20. #sudden