What were aqueducts made of?

Related questions

1. How old is the Roman aqueduct?
2. When were viaducts built?
3. What is the purpose of an aqueduct?
4. What does an arch symbolize?
5. How long did Gladiators live?
6. What is Rob bridge?
7. How are aqueducts built?
8. What is the Aqueduct of Segovia made of?
9. What is the most famous Roman aqueduct?
10. Why was the Aqueduct so important?

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24. #still
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26. #combination