Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature.

VOA: special.2010.07.27

But you must be careful. It is easy to get lost in the waves of moving sand especially during sandstorms.

VOA: special.2010.01.04

Workers have been placing long lengths of containment booms around the oil as winds and waves push it toward shore.

VOA: special.2010.05.01

He faced winds blowing more than one hundred twenty kilometers an hour, and ocean waves at least twenty meters high.

VOA: special.2009.03.22

The navigator also had to add any movement of the ship to the side caused by waves or the wind.

VOA: special.2009.12.23

The wind came again. Finally,the men heard a new sound C the sound of waves breaking and crashing on the shore.

VOA: special.2010.03.06

So are the coastal cities of Santa Monica and Malibu, where people like to ride surfboards on the Pacific Ocean waves.

VOA: special.2010.01.03

The radio waves are measured when the earth is at two points opposite one another in its orbit.

VOA: special.2009.01.20

Sometimes the birds sat down on the sea in groups, near brown seaweed that rolled on the waves.

VOA: special.2010.03.06

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

VOA: special.2010.01.05

These areas, called cosmic masers, are rich in gas molecules that have the effect of strengthening radio waves.

VOA: special.2009.01.20

A passenger on a boat who is feeling very sick from high waves may look very green.

VOA: special.2009.11.15

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

The Anderson reported winds of about one hundred forty kilometers an hour and waves ten meters high.

VOA: special.2009.11.11