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The strength and direction of the Earth's magnetic field at some locations never change. changes significantly every year. changes significantly many times per day. may change significantly over hundreds of years.

The strength and direction of the Earth's magnetic field at some locations never change. changes significantly every year. changes significantly many times per day. may change significantly over hundreds of years.

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The strength and direction of the Earth's magnetic field at some locations never change. changes significantly every year. changes significantly many times per day. may change significantly over hundreds of years.

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