Earth’s magnetic field ____.?
a. ?changes polarity due to motions in Earth’s mantle, while plate motion remains relatively stable
b. ?changes polarity due to motions in Earth’s core, while plate motion remains relatively stable
c. ?changes polarity due to motions in Earth’s crust, while plate motion remains relatively stable
d. ?remains stable, while plate motion oscillates back and forth
e. ?remains stable, while magma motion oscillates back and forth
ANSWER: b
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