The magnetic field of Earth in the geologic past is ____________.
A)unknown,but it is assumed to have been identical to today's
B)known to have been constant through geologic time,due to remnant magnetization of iron-rich minerals in rocks
C)known to have experienced numerous polarity reversals,due to remnant magnetization of iron-rich minerals in rocks
D)known to have been constant through time,on the basis of theoretical calculations

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The Answer of The magnetic field of Earth in the geologic past is ____________.
A)unknown,but it is assumed to have been identical to today's
B)known to have been constant through geologic time,due to remnant magnetization of iron-rich minerals in rocks
C)known to have experienced numerous polarity reversals,due to remnant magnetization of iron-rich minerals in rocks
D)known to have been constant through time,on the basis of theoretical calculations

The Magnetic Field of Earth in the Geologic Past Is