TIDES are the alternate rising and falling of sea levels along the COAST. They are caused by the gravitational pull of the moon and, to a lesser degree, the sun. Much activity along the coast, both human and animal, responds to the rhythm of the tides. There are 3 tidal cycles: daily, monthly and annual. During the daily cycle—actually 24 hrs, 50 mins—the tide fluctuates twice between high and low. One of the fluctuations is usually smaller than the other. Every day tidal peaks occur about...

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