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How do we measure gravity? We measure it by the center of mass of it, not the actual surface

Why are there two high tides and two low tides? The Earth's rotation causes us to experience eah tide twice a day.

Why does the Earth "stretch"? The side of Earth that faces the moon is pulled harder than te other side causing it to stretch.

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They occur twice monthly and are called neap and spring tides

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coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart. It takes six hours and 12.5 minutes for the water at the shore to go from high to low, or from low to high.

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Tides are caused by the gravitational interaction between the Earth and Moon

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the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.