The answer to each clue is a U.S. state or world capital city. Wordplay is fair play.

1. What city is a sofa?
2. What city is a very hard substance?
3. What city is found in a library?
4. What city is a kind of paper?
5. What city is a small stone?
6. What city is a briny body of water?
7. What city is a perfume?
8. What city likes to wander about?
9. What city is an omelet?
10. What city is an explorer?
11. What city is heavenly?
12.. What city is an improvement on Noah's boat?

Answers:

1. Davenport, IA
2. Flint, MI
3. Reading, PA
4. Manila, Philippines
5. Little Rock, AR
6. Salt Lake City, UT
7. Cologne, Germany
8. Rome, Italy
9. Denver, CO
10. Columbus, OH
11. Providence, RI
12. Newark, NJ