Interesting things about the world - rising and falling of the sea level???

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I am not sure about USA, but in country that i am coming from, they have been teaching us about rising and falling of the sea level known as tide. For those who were actualy studying any of branches of science conected to Earth science, this sounds like a bad joke. Have you ever been thinking about this topic? What is causing the changing of the sea level? Is it posible that water could appear or dissapear durig the night or day? By the phisics low of interaction of masses, the object with bigger mass affects the one with the smaller as well as the smaller affects bigger. Thus, if we consider that Earth's tectonic plates are "floating" on astenosphera, the affect of the Moon can cause rising or falling of the plates causing the affect that we usualy call changing of the sea level. What do you think? Have they been theaching us wrong?