Across
- 3. a substance or material in which things grow or exist
- 5. a wave (such as a sound wave) in which the particles of the medium vibrate in the direction of the line of advance of the wave
- 6. a wave in which the vibrating element moves in a direction perpendicular to the direction of advance of the wave
- 8. the top of a wave
Down
- 1. variation,fluctuation
- 2. relating to sound and the way people hear things
- 4. the distance in the line of advance of a wave from any one point to the next point of corresponding phase
- 7. a space that is completely empty of all gas, especially one from which all the air has been taken away