The moon's gravity affects the tides and the Earth's rotation.
Meaning: The moon's gravitational force has an influence on the tides and the spinning motion of the Earth.
Choice of Words: Gravity is the force that attracts objects towards each other. Affects means to have an influence on something. Tides are the periodic rise and fall of the sea level, and Rotation is the spinning motion of the Earth on its axis. When you put them together, you get a sense of the moon's gravitational pull influencing the tides and the Earth's spinning motion.
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