Fill in each blank with ONE suitable word.
EL Nino and La Nina
The tropical Pacific Ocean (1) ... a warming and cooling cycle. This cycle is a completely natural event and usually (2) ... between three to seven years.
When the waters become (3) ..., it is called El Nino, and when they become cooler it is called La Nina. During the cycle, the (4) ... of the ocean can change by around 3°C between the warmest and coolest times.
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