Unformatted text preview: Earth closest to the Moon is pulled towards it slightly more than the centre, while the part furthest away is pulled towards it slightly less. This means that the Earth becomes (very slightly) egg shaped, and since there is only so much water to go around this causes high tides on the "front and back" of the Earth (as seen from the Moon) and low tides on the sides. Below is a nice diagram illustrating this and also why we have Spring tides (much more extreme) and Neap tides (much less extreme) at different times of the year....
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- Winter '08