Earth's magnetic field
A) is variable, and it has phased to zero some nine times during the past 4 million years.
B) is constant in its intensity.
C) remains a mystery as to its cause.
D) is principally generated in the inner core.

Name: Earth's magnetic field A) is variable, and it has phased to zero some nine times during the past 4 million years. B) is constant in its intensity. C) remains a mystery as to its cause. D) is principally generated in the inner core.
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The Answer is A

Earth's Magnetic Field