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Tidal bores
They are surf-like waves that rush up a river, then down it. Raft surfing on them is a local sport. Unfortunately, some tidal bore sites are now only wimpy versions of their former selves due to downriver construction projects.
What causes the tides
Several natural forces create the Bay of Fundy tides.
Gravitation
From the sun and moon.
Bay's funnel shape
As the bay's width and depth decreases, the tide's momentum and therefore its height increases
Other factors
The water level will be higher when its full or new moon - or when the moon is closest to the earth during its orbit - or when an ocean storm creates a surge.
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