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Across
  1. 2. Opposing force
  2. 4. Downward force
  3. 7. Time period
  4. 10. Small device that manipulates airflow
  5. 11. Intersect
  6. 12. Measurement of height
Down
  1. 1. Rule
  2. 3. Upward motion
  3. 5. Planes have two
  4. 6. Cleverness
  5. 8. In the air
  6. 9. Very large
  7. 13. Backward force