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Which Phenomenon Is a Major Cause of the Periodic Glacial

Question 60

Multiple Choice

Which phenomenon is a major cause of the periodic glacial advances and retreats that have occurred over the last two million years?


A) The Pacific Decadal Oscillation (PDO)
B) El Niño Southern Oscillation (ENSO)
C) Periodic changes of Earth's orbit from more circular to more elliptical
D) Changes in the rate of continental drift

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