Sound in brief but remarkeable terms is a vibration, that our ears percieve by the sense of hearing. Most commonly vibrations travel to our ears via the air. The ear then converts these sound waves into nerve impulses that are sent to our brains, where the impulses become sound. To say all that in a more technical language: Sound "is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material" (Olson 1957). Sound is also a series of mechanical compressions and rarefactions or longitudinal waves that successively propagate through media that are at least a little compressible. What causes sound waves is known as "the source of waves". Examples of sounds sources is: A violin string that vibrates upon being bowed or plucked.
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Some students spend too much time studying because they did not take the time to learn what was being taught in class the first time. If you follow these four tips, you will learn how to understand each lesson being taught in class so you will not have to put in extra time studying. This does not mean you will not have to study, but this will become a guide so you can use your time wisely. While you are in class, sit back and learn as much as you can and you will almost certainly get better grades and have more free time. 
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