Jonathan

1. what materials were used? romans used wood metal terrecotta and ceremicts

2. did they use marble? yes the romans used marble to make a statue of julius cesar

3. how did romans discover cement? yes romans discovered cement because the egyptians used to use it to

4. how did they make 7 aquaducks? they had to find a spring and lots of water for a hole city

5. how old is the cement they used to make the collosieum?

For more information visit http://en.wikipedia.org/wiki/Roman_concrete http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JPEPE3000127000003000109000001&idtype=cvips&gifs=yes&ref=no