Across
- 2. When a wave pushes together.
- 4. The subject of which this crossword is based.
- 7. A wave type that moves up and down.
- 8. The speed at which the wave changes directions.
- 9. A wave type that pushes and expands.
Down
- 1. When a wave pushes apart.
- 2. The highest point of a wave.
- 3. Distance between two crests.
- 5. The lowest point of a wave.
- 6. Distance moved between two points.