Eventually, you will know much material for each of the 3 cities. To get you started, however, I have a sample set of questions.
A. NYC b. Los Angeles c. Chicago
1. Mediterranean climate type.
2. Tectonic plates and earthquakes.
3. Walt Disney Concert Hall.
4. City spread over a 500 square mile area.
5. El Pueblo de Nuestra SeƱora la Reina . . .
6. A mountain range splits this city.
7. Largest city in the most populous state.