How Do Geologists Know That the Magnetic Field of Earth

question 26

Multiple Choice

How do geologists know that the magnetic field of Earth has changed constantly over time?

• A) by the direction of historical lava flows, which they have been able to date with radioactive dating methods
• B) by crystals that have formed in metamorphic rocks
• C) by records kept in magnetic rock-forming minerals
• D) by analyzing and extrapolating records kept by scientists since the 1600s

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