Wheel and Axle

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Across
  1. 5. Area where wheel was first invented
  2. 7. Turning the wheel requires more __________
  3. 8. The rod around which the wheel rotates
  4. 9. Which is easier to turn, the wheel or axle?
  5. 10. Oldest known image of a wheel
  6. 12. The wheel and axle spin around the _________
  7. 13. A wheel and axle is just like a _________ that rotates
Down
  1. 1. Abbreviation for "Before common era"
  2. 2. Example of a wheel and axle
  3. 3. Turning the wheel requires less __________
  4. 4. What type of a machine is a wheel and axle?
  5. 6. Word that means 1000 years
  6. 11. American civilization before Mayan and Aztec