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This is an aqueduct which was made using concrete.
Cement is made by mixing sand with limestone, small stones, clay, and water.
Romans were the first ancient civilization that used a lot of concrete.
Romans usually built the structure in concrete and covering it with bricks to make it look more pretty.
Concrete has made the dome on the Pantheon and the dome on the Hagia Sophia possible.
Romans were also the first to use reinforced concrete which is concrete blocks with metal poles through them. Reinforced concrete was used to build aquaducts.
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