The statement 'El Nino is a series of volcanic eruptions caused by tectonic activity' is false.
<u>Explanation:
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The phenomenon of El Nino is associated with the rising of temperature levels of the waters in the central Pacific.
When the water temperature in the 'central Pacific ocean' rises above a certain level and maintains itself for a long period of time, it is said to be the occurrence of El Nino.
It is because of the emergence of El Nino that most areas in the world experience variation in the normal precipitation patterns.