The Moon's gravitational pull on Earth causes tides! What is a tide? Check out the videos at these links:
http://videos.howstuffworks.com/hsw/10000-the-moon-tides-video.htm
This page also includes many different videos about the moon that answer some interesting questions such as 'How did the Moon form?'
The second video is from NASA:
http://www.nasaimages.org/luna/servlet/detail/NVA2~15~15~53648~124808:What-is-a-Tide
The animation at the link below illustrates how high and low tides work. There are about two high tides and two low tides every day.
http://science.nasa.gov/headlines/images/missingtides/dissipation.gif
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