How Do Tides Work?
ES2406  Tides at the Bay of Fundy

The tides in Canada's Bay of Fundy are the most extreme in the world. Because of the unique shape of the bay, the difference in water level between high tide and low tide can be as much as 48 feet (14 meters). Observing tidal changes over time at any coastal location can show interesting patterns. These patterns can reveal the relationship between tides and the lunar cycle.


  !   Move your cursor on and off the image to see photographs of high tide and low tide. Click the low tide image to see a ground view of the area at low tide.

In this investigation, you’ll be examining tide images from Cape Porpoise Harbor, Maine. By observing the tide patterns, you'll be able to make a connection between tides and phases of the moon.

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