When there is fresh snow on the ground, the surface of the snow takes in, or absorbs,sound waves.

VOA: special.2010.01.05

The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

In coastal areas it can swell,or enlarge, to waves of up to thirty meters high.

VOA: special.2009.03.17

Electromagnetic waves or energy passed through the air from one device to the other.

VOA: special.2010.12.08

They built or improved existing walls and floodgates to block the waves.

VOA: special.2009.03.17

"And there is no way to know if the current or the wind or the waves or what is going to affect it.

VOA: standard.2010.07.05