What is the purpose of a viaduct?

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  1. #another
  2. #carry
  3. #bridge
  4. #railway
  5. #spans
  6. #series
  7. #viaduct
  8. #purpose
  9. #usually
  10. #water
  11. #valley
  12. #towers
  13. #arches
  14. #between
  15. #bridges
  16. #supported