Think of a big bathtub, how when you move a little you get small changes on the surface like waves so at any given time the water is a little higher on one side, but lower on the other. There is the same amount of water overall. Those little waves you made is like the moon causing tidal changes.
Now imagine adding in a glass of water. The overall water level has gone up, by a little bit. Everything else acts the same as before.
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