Tide

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The Bay of Fundy at high tide
The Bay of Fundy at high tide
The Bay of Fundy  at low tide
The Bay of Fundy at low tide

Tides are the periodic rising and falling of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans. Tides cause changes in the depth of the marine and estuarine water bodies and produce oscillating currents known as tidal streams, making prediction of tides important for coastal navigation. The strip of seashore that is under water at high tide and exposed at low tide, the intertidal zone, is an important ecological product of ocean tides.

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