science

why is a sound made when door is slam ?
why is a sound made whenyou rub yoyr fingers on comb teeth?

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asked by sue
  1. You will find ideas here:

    http://www.google.com/search?q=why+a+sound+is+made&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

    Sra

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