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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.
So there is a high tide bulge on two opposite sides of the earth at once, and of course then there are two low tide areas at roughly 90 degree angles to the high tides. A:Tidal forces are caused by the differential pull of gravity on a planetary body or moon. Consider the Earth-moon system.