Your friend says that, when a compass is taken across the equator, it turns around and points in the opposite direction. Your other friend says that this is not true, that people in the Southern Hemisphere use the south magnetic pole of the compass to point toward the nearest pole. You're on; what do you say?
What will be an ideal response?
Answer: Tell your first friend that the magnetic field of the Earth is continuous from pole to pole, and certainly doesn't make a turnaround at the Earth's equator; so a compass needle that is aligned with the Earth's field likewise does not turn around at the equator. Your other friend could correctly argue that compass needles point southward in the Southern Hemisphere (but the same pole points southward in the Northern Hemisphere). A compass does not turnaround when crossing the equator.
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