• Tides are mainly caused by the gravitational pull of the Moon and somewhat by the Sun. Over several hours the water rises or advances up a beach in the flood. The water reaches its highest level and stops at high water. Because tidal currents cease this is also called slack water or slack tide. The tide reverses direction and is said to be turning. The sea level lowers or falls over several hours during the ebb tide. The level stops falling at low water. This point is also described as slack or turning. Tides occur in the open ocean and the differences in sea level would probably be visible as surface currents.

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