Why do aqueducts have arches?

Related questions

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2. How do aqueducts work?
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5. Does the Segovia aqueduct still work?
6. What is the Aqueduct of Segovia made of?
7. What is Rob bridge?
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10. What is the difference between flyover and bridge?

Tags

1. #amounts
2. #structures
3. #romans
4. #substance
5. #result
6. #ancient
7. #water
8. #provided
9. #aqueducts
10. #massive
11. #weight
12. #created
13. #explore
14. #freed
15. #architects
16. #cities
17. #build
18. #support
19. #which
20. #roman
21. #could
22. #arches