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The earth's magnetic field was flipped by 180° a million years ago. This flip was relatively rapid and took 105 years. Then the average change in orientation per year during the flip was closest to, 

(A) 1 second. 

(B) 5 seconds. 

(C) 10 seconds. 

(D) 30 seconds.

1 Answer

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The correct option is (B) 5 seconds.

1° = 3600 arc sec average change in orientation per year.

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