physics notes for test (chapters 1,2,3,9,10) no numericals: what are 2 evidences of the existence of earths magnetic field?

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what are 2 evidences of the existence of earths magnetic field?

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1. A freely suspended magnet will always point in the geographic north-south direction.
2. an iron rod buried inside the earth a few meters in the north-south direction and taken out after a few days becomes a weak magnet, which is only possible if the earth acts like a magnet itself.

physics notes for test (chapters 1,2,3,9,10) no numericals

What are 2 evidences of the existence of earths magnetic field?

1. A freely suspended magnet will always point in the geographic north-south direction. 2. an iron rod buried inside the earth a few meters in the north-south direction and taken out after a few days becomes a weak magnet, which is only possible if the earth acts like a magnet itself.

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