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Chapter_8 - Chapter 8 Tides Tides are waves with very long...

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Chapter 8 Tides Tides are waves with very long wavelengths. Topics for this chapter include: Tidal characteristics The origin of the tides Tides in small and elongated basins Tidal currents Power from the tides Animals and the tides
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Tidal Characteristics Tides are single waves that stretch across ocean basins. They are shallow-water waves , because their wavelengths greatly exceed the depth of the ocean. They occur because of interactions of the ocean with the sun and the moon.
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Tidal Characteristics Tides can be classified based on their daily period and regularity. Diurnal tides have one high tide and one low tide daily.
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Semidiurnal tides have two high tides and two low tides daily.
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Mixed tides have two high tides and two low tides daily, but successive high and successive low tides are of unequal height.
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Spring and neap tides Day of the month
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Origin of the Tides Unlike wind-driven, surface waves, tides are cause by the gravitational attraction of the sun and moon. Gravitational attraction All masses are drawn to each other. The strength of the attraction varies: Directly with the masses of the interacting bodies. Inversely as the cube of the distance between the interacting bodies.
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Origin of the Tides Because the moon is much closer, it exerts a greater gravitational effect on the Earth than does the sun, despite the fact that the sun is much more massive than the moon.
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Centrifugal effect The centrifugal effect arise as the Earth and Moon revolve around one another.
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