Answer to Question #63716 in Other Physics for Afroz

Question #63716
Moon raise tides on the sea but why not it raise tides on the river?
1
Expert's answer
2016-12-10T04:02:09-0500
Tides form because the gravitaty of the Moon moves large amounts of water in seas and oceans. Rivers have relatively small width, thus the effect is not significant. However, a tidal phenomenon called Pororoca is observed in Amazonia. When the tide is high, water flows in from the Atlantic ocean into Amazon river. As a result, Amazon's flow reverses.

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