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    Exam 3: Plate Tectonics
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    How Many Times Did the Earth's Magnetic Field Switch from North
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How Many Times Did the Earth's Magnetic Field Switch from North

Question 30

Question 30

Multiple Choice

How many times did the Earth's magnetic field switch from north to south in the last 10 million years?


A) many - more than 20 times
B) seldom - less than 5 times
C) never

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