We did on the topic 'Sounds'.I learnt the particular topic in our school science textbook and borrowed some books from the library.I also did some research in the internet about sounds.
Sound is made when something vibrates, it moves back and forth.A vibrating object could be a speaker on a CD player, or your vocal cords or even the strings on a guitar.
As it vibrates, it pushes the air molecules next to it closer together, in patterns corresponding to the movements of the object.
Sound can also be used to do useful jobs. For example; Sound waves sent into the womb of a pegnant woman will be deflected in patterns representing the outline of the fetus within.
(Source taken from www.yahoo.com)
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