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The Earth magnetism, caused by the spinning iron core of our planet, is used by many things like:

- a compass to define north

- birds (to navigate)

- hypothyzed fish use it for navigatoin as well

- magnetic field, which protects our precious atmosphere

- archeologists and geologists to define where a specific area used to be in the past

- etc

I'm guessing you were looking for "compass".

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12y ago

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