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

question 16

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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The average period that a person may expect to live.

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