Across
- 6. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action
- 7. a wave vibrating in the direction of propagation
- 8. the lowest point of a wave
- 10. an elastic wave in the earth produced by an earthquake or other means
- 12. diminution in the density of something, especially air or a gas
Down
- 1. the maximum extent of a vibration or oscillation, measured from the position of equilibrium
- 2. the rate at which something occurs or is repeated over a particular period of time or in a given sample
- 3. a wave vibrating at right angles to the direction of its propagation
- 4. the highest point of a wave
- 5. a disturbance in a medium that carries energy without a net movement of particles
- 9. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave
- 11. the reduction in volume (causing an increase in pressure)