Across
- 4. What waves do to push ducklings forward
- 5. A substance that can flow easily, like water or air
- 9. Baby ducks that swim behind their mother
- 11. What the mother duck creates as she swims
- 13. The lowest part of a wave where ducklings position themselves
- 14. When ducklings concentrate wave energy for siblings behind them
- 15. What happens when two waves interact in the same medium
- 18. Ducklings must swim at the same rate as their mother
- 19. The fluid medium where ducks swim
Down
- 1. When waves propel a duckling forward
- 2. Water birds that also swim in formation with their babies
- 3. Mathematical tool used to test the hypothesis
- 6. A force that opposes an object's motion through a fluid
- 7. How far ducklings swim from their mother matters
- 8. Where ducklings must swim to save energy
- 10. The shape of the formation that saves energy
- 12. A substance that carries a wave
- 16. The arrangement of swimming in a line
- 17. What the ducklings save by swimming in formation