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The moon pulls the ocean on the near side of the earth more than it pulls on the center of the earth. The pull on the ocean at the far side of the earth is smaller still. This causes the near ocean to accelerate toward the moon most, the center of the earth less, and the far ocean still less.
Tides are the daily or twice daily rise and fall of the oceans. Tides are caused by the gravitational pull of the moon and sun on the ocean. Click to view larger and see the legend. The difference between high tide and low tide is called the tidal range.