PT 15 S3 Q25

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When volcanic lava solidifies, it becomes uniformly magnetized in the direction ... ...

Which one of the following, if true, most seriously undermines the conclusion that the change in the direction of the Earth's magnetic field happened very slowly?
(A) The changes in the direction of the Earth's magnetic field are determined by the chaotic movement of iron-containing liquids in the Earth's outer core.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 3 - Difficult/Uncommon Mix (25Q)

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