Question

How often dose earth's magnetic field change direction?

Answer 1

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.

Answer 2

It changes direction every 200,000 years

Step-by-step explanation: