Identify the best evidence of the Earth having a magnetic field.

All things fall towards the Earth's center

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Wind blows from East to West

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Oceans on Earth have current

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All compass needles lines up with it

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Solution

The correct option is D All compass needles lines up with it
Needle of a magnetic compass is a magnetic material that aligns itself to the magnetic field direction around its surrounding. Even if there is no magnet around the compass it always aligns itself in the north-south direction of the Earth, which verifies that Earth has a magnetic field.

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