Since the most aboundant elements by weight on Earth's crust are:
- Oxygen 46.6%
- Silicon 27.7%
- Aluminum 8.1%
- Iron 5.0%
Would it be possible to build an entire city out of just these elements? So, for example, glass would be OK because is mainly made of SiO2.
The city must have:
- Tall buildings (>20 floors)
- Electrical energy network (don't need to produce it though)
- Communication network (Internet access)
- Water and Drain system
All other non-infrastuctural objects (food, clothes, forniture, appliances, etc.) and living beings are allowed
Buildings: can the buildings be made out just of Al/Fe or an alloy of them?
Transport: maybe transport by train can be acheived?
Electricity: Al can be easly used as a conductor and some glass fibre as insulator.
Telecom: wireless or Al
Water: I would say Al again
Aluminium is very versatile indeed :D