Reversals in the Earth's Magnetic Field Have Probably Been Caused

question 4

Multiple Choice

Reversals in the Earth's magnetic field have probably been caused by:

• A) reversals in the polarity of the Sun's magnetic field.
• B) variations in convection currents in the outer core.
• C) changes in the direction of tectonic plate movement.
• D) reversals in the direction of the Earth's rotational axis.

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