What causes tides and why do they vary from one day to the next
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Answer:
The Short Answer: High and low tides are caused by the Moon. The Moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the Moon and the side farthest from the Moon.
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Explanation:
The tides--the daily rise and fall of the sea's edge--are caused by the gravitational forces between the earth, the moon and the sun. Since the moon is closer to our planet than the sun, it exerts a stronger gravitational pull on us. (The sun only has 46% of the tide-generating force of the moon.)
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