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tide
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how the Sun and Moon cause tides
The video thumbnail image shows a graphic of the Earth with two tidal bulges. Blue arrows point to the bulges against a white background.
Understand why there are high and low tides on the earth every day
How does the Moon affect Earth's tides?
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how the Sun and Moon cause tides
how the Sun and Moon cause tides Tides are caused by the gravitational pull of the Sun and the Moon on Earth's water. When the Sun, Moon, and Earth form a straight line (left), tides higher and lower than usual are generated. In contrast, when the lines between the Sun and Earth and the Moon and Earth are perpendicular to one another (right), high tides and low tides are moderated.

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Written by
Ronald A.R. Tricker
Staff Inspector for Science, Ministry of Education, U.K., 1946–62. Author of Bores, Breakers, Waves and Wakes; The Contributions of Faraday and Maxwell to Electrical Science; and others.
Ronald A.R. Tricker,
Arnold L. Gordon
Professor of Oceanography, Columbia University. Editor of Studies in Physical Oceanography (2 vol.).
Arnold L. Gordon•All
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News •

Bronwyn Oliver’s Tide breaks record for Australian sculpture after selling for $1m • Nov. 27, 2024, 12:17 AM ET (The Guardian)

tide, any of the cyclic deformations of one astronomical body caused by the gravitational forces exerted by others. The most familiar are the periodic variations in sea level on Earth that correspond to changes in the relative positions of the Moon and the Sun. The tides may be regarded as forced waves, partially running waves and partially standing waves. They are manifested by vertical movements of the sea surface (the height maximum and minimum are called high water [HW] and low water [LW]) and alternating horizontal movements of the water, the tidal currents. The words ebb and flow are used ...(100 of 837 words)

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