What is the dynamo model of Earth's magnetic field?
A) Earth's magnetic field is maintained by convection in the interior of the planet, as well as its rotation.
B) Electric currents in the atmosphere (aurora) generate Earth's magnetic field.
C) Currents in Earth's oceans maintain the planet's magnetic field.
D) Earth's magnetic field changes too rapidly for it to be generated in Earth's interior.
E) None of these choices are correct.
Correct Answer:
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