How often dose earth's magnetic field change direction?

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asked Oct 20, 2020 110k views

2 Answers

Ghanshyam Nakiya · Answer 1 · 2020-10-21T23:05:25+0000

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.

How often dose earth's magnetic field change direction?

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