What evidence do we have that Earth's magnetic field reverses its polarity every 250,000 years?
A) historical documents from ancient Egypt and other civilizations
B) The direction of the magnetic field is "frozen" into new crust as it cools.
C) Core samples from Antarctica show a regular change in polarity.
D) Earth's magnetic field strength and direction change constantly.
E) All of these choices are correct.
Correct Answer:
Verified
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