Multiple Choice
On the average,how long does a spin flip of Earth's magnetic field require? That is,how long is required to flip the field from one direction to the other?
A) a few thousand years
B) a few hundred thousand years
C) a few million years
D) forever. As far as we know, Earth's magnetic field has always pointed in the same direction.
Correct Answer:
Verified
Correct Answer:
Verified
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