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Science » Earth Sciences » Oceans

Tides and Water Levels

examines the complex systems that govern the movement tides and water levels. Learn what causes tides, what determines their frequencies and variations, and how they're monitored and measured. Find lessons on forces that affect tides and how lunar cycles affect living organisms. Use the "roadmap" to find data and predictions regarding water levels and coastal currents -- information on which maritime activities throughout the world depend. (National Oceanic and Atmospheric Administration)

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Interesting Fact:

The moon is a major influence on the Earth's tides, but the sun also generates considerable tidal forces. Solar tides are about half as large as lunar tides and are expressed as a variation of lunar tidal patterns, not as a separate set of tides.
This map shows the geographic distribution of different tidal cycles.

Types of tidal cycles

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