El Niño is the name for a special set of climatic conditions that occur once every four years in the Southern Hemisphere. What is the root cause of El Niño?
A. Increasing discharges of fresh water into the oceans, a result of warming climate, shuts down ocean circulation patterns in the southern Pacific Ocean.
B. Normal east-to-west trade winds disappear, causing warm water to stagnate in the eastern Pacific Ocean.
C. Slight oscillations in the rate of rotation of Earth affects thermohaline circulation in the southern Pacific Ocean.
Answer: B
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