The moon’s gravitational force will pull on water in the oceans, making so called “bulges” in the ocean on both sides of the planet. While the moon pulls water towards it, it creates this “bulge”. The water on the other side of the earth, opposite the moon, has another bulge which is caused by the moon essentially pulling the Earth away from the water that lies on that side.
High tides happen on the coasts when the moon is directly overhead, which will happen on opposite sides of the planet. “During the day, the Earth rotates 180 degrees in 12 hours. The moon, meanwhile, rotates 6 degrees around the earth in 12 hours. The twin bulges and the moon’s rotation mean that any given coastal city experiences a high tide every 12 hours and 25 minutes or so” (http://science.howstuffworks.com/question72.htm).
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