AP Environmental Scienceeasymcq1 pt
El Niño events typically recur every
A.2–7 years
B.2–7 months
C.every 100 years
D.every week
Explanation
Core Concept
ENSO oscillates irregularly; warm and cool phases each last about a year, cycling on a 2-to-7-year rhythm.
Correct Answer
A2–7 years
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