Drop a pebble into a still pond. A circle of pushed-up water forms around the spot where the pebble entered the water. These little waves move outward. As these waves spread out, they mover less and less water, until they stop altogether.
Similarly, when a sound is made, waves form. These sound waves are invisible.
Waves are a way of moving energy from one okace to another. As the energy moves, it makes waves.
Soundwaves resemble water waves. The highest prt of the wave is called the crest. The distance between the crests is called the wavelength. The lowest point of a wave is called a trough.
Bibliography
Sonar, by Karen Price Hossell
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