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Which of the Following Phenomena Triggers an El Niño-Southern Oscillation

Question 27

Multiple Choice

Which of the following phenomena triggers an El Niño-Southern Oscillation event?


A) development of an unusually cold high-pressure air mass in the Antarctic region
B) increased freshwater added to the surface currents, resulting in low salinity
C) reversal of high- and low-pressure areas in the equatorial central Pacific Ocean
D) cold water upwelling in the eastern Indian Ocean

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