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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.
The Cause of Tides (easy version) What causes the tides? The simple answer is gravity - mainly the gravitational pull of the Moon. More precisely, the cause is the fact that its gravitational force decreases with distance. The Sun also has quite a large effect, but for all practical purposes we can ignore the effects of all the other heavenly bodies.