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3) What does the earth do to the sea levels?
Answer: to rise and fall by a meter or 2 everyday

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2) How many kilometers are we away from the center of the earth?
Answer: 6400 km

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the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of Earth.

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Neap tides are especially weak tides. They occur when the gravitational forces of the Moon and the Sun are perpendicular to one another (with respect to the Earth). Neap tides occur during quarter moons. The Proxigean Spring Tide is a rare, unusually high tide.

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Tides are the rise and fall of sea levels

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1) What is Tidal Force?
Answer:  an apparent force that stretches a body towards and away from the center of mass of another body due to a gradient in gravitational field from the other body

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the Earth rotates through two tidal “bulges” every lunar day, 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.