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Sound is energy made by vibrations.When a object vibrates it makes movment in the air particles called sound waves.
Pitch is the rate of vibrations are produced this is exspesped by cycles per second.
This is my sound prezi!
Sound travels by a movment.The movment is started by a object this causes the molucules to bump into each other and create sound waves.
If you pluck a string gently it is quieter than but when you pluck it