help with history question

History
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History question.docx  Can anyone help answer these question. Only 1 or 2 sentences  per question 

Feb 19th, 2015

The aqueducts were largely a gravity system. They had to keep the water at a certain level because if they lost that level, it was hard to get it back up again. So to maintain a slope towards the city and to bring it in at a high enough level, you had to keep the channel at a certain height. So when that channel came to a dip in the landscape they built an arcade or a bridge to take the water over it. Look around this site as well. It provides tons of information.

http://www.history.com/news/history-lists/10-innovations-that-built-ancient-rome

Feb 19th, 2015

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Feb 19th, 2015
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Feb 19th, 2015
Dec 3rd, 2016
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