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June 1995 LSAT Section 3 Question 25

When volcanic lava solidifies, it becomes uniformly magnetized in the direction in which the Earth's magnetic field p...

Samirah on July 15, 2021

Can you explain this?

I am unsure of why the correct answer is correct. Please explain!

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Emil-Kunkin on June 23 at 07:16PM

B is correct because it tells us that it is possible for such a change in magnetization to occur quite quickly. It shows that within a fairly short period, that needed for cooling to occur within a flow, a rapid change in magnetization can occur. This directly contradicts the conclusion.