How often dose earth's magnetic field change direction?

It changes direction every 200,000 years

Explanation:

It reverses every 200,000 years but it varies. In the span of a 72 million years it changed 5 times. The most recent one was 780,000 years ago so we are overdue for one. Some people theorize that the poles melting are the early stages of the field changing.

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Explanation:

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