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earth

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spinning through the solar system

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proudly bearing a majestic magnetic

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field emanating deep within its molten

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metallic core

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the ever-changing field is full of

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fluctuations from many sources

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satellites observing these oscillations

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let scientists identify individual

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sources creating the magnetic field

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one such source is the motion of the

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ocean

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a pull and are dragged along a little

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the back and forth of the tides cause a

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small wiggle in the magnetic field

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scientists have isolated this one small

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oceanic signal measuring it from a