In this video, by Paul Hewitt, the author of our physics text book, does a great job explaining the tides and how the gravitational pull between the earth and the moon have to do with each other. Hewitt talks about how the force between earth and the moon causes the ocean to be pulled towards the moon. When the earth rotates, taking a total of 24 hours to do so, there is a high tide twice (every 6 hours) and a low tide also twice (every 6 hours). The high tide occurs when that side of the earth is facing towards the moon, causing the force to pull the ocean towards it, and this happens on the opposite side of the earth as well because of the negative pull. This causes the shape to be an oval with the earth in the middle rotating.
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