The moon creates tides because of the large distance between the water on the side of the planet facing the moon and the water on the opposite side. Gravity gets weaker as distance increases, so it pulls on the water closest to it stronger than it does on water that’s farther away.
This creates a “tidal bulge” that the earth rotates inside of. Local geography and other physics stuff can change the exact timing of when the tides happen.
It’s not just gravity, but the difference in gravity. That’s what Tides/Tidal force means.
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