AP Environmental Scienceeasymcq1 pt
El Niño begins when trade winds in the Pacific
A.weaken, letting warm water shift eastward
B.strengthen dramatically
C.reverse direction every winter
D.stop completely forever
Explanation
Core Concept
Weak easterlies stop piling warm water in the west; it sloshes toward South America, suppressing the cold upwelling — the ENSO warm phase.
Correct Answer
Aweaken, letting warm water shift eastward
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