Gravity - High tide
High tide
The gravitational forces of the Moon and Sun pull on Earth's surface water, causing tides, or water surges, twice a day. The Moon has a stronger gravitational pull because it is closer to Earth than the Sun. Twice a month, when the Sun, Moon, and Earth are aligned, the force of their gravitational pull causes the highest tides, called spring tides. When the Sun and Moon are at right angles, they pull in different directions and have a weaker gravitational pull. Then lower tides, called neap tides, take place.
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