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Sound
 
Clouds of exhaust form around a rocket as it launches

A rocket launch creates lots of energy which means the sound is very loud to our ears. Image Credit: NASA

      a type of energy that can be heard



Sentences:
Sound can travel through air, water and even metal.

Some NASA airplanes can fly faster than the speed of sound.




More Information:
http://ksnn.larc.nasa.gov/webtext.cfm?unit=sound   →
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/What_is_Sound.html