An Empire of Puzzles!

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Across
  1. 2. Gave something and got something in return.
  2. 4. Buildings or things that are built, like bridges or towers.
  3. 6. Flat signs made of metal or wood that show names or facts.
  4. 9. A hard, white material from elephant tusks.
  5. 10. Shapes or pictures cut into wood or stone.
  6. 11. Twisting and turning, like a snake or a curvy road.
Down
  1. 1. Periods of 100 years each.
  2. 3. A brownish metal used to make statues and coins.
  3. 5. Art made by shaping clay, stone, or metal.
  4. 7. Very, very far from where you are.
  5. 8. Very smart or ahead of its time.