ST Alpha - "National Geographic: "Earth's magnetic field has flipped many times over the last billion years, according to the geologic record." -- (link)" (Reading a Post)

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In response to "the magnetic poles move around a bit, but they aren't going to flip and cause unprecedented disasters -- nm" by ceregon

National Geographic: "Earth's magnetic field has flipped many times over the last billion years, according to the geologic record." -- (link)

Posted by mara Mar 14 '12, 12:39

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http://news.nationalgeographic.com/news/2004/09/0927_040927_field_flip.html (news.nationalgeographic.com)

Responses:

" It's fairly common knowledge that the Earth's magnetic field periodically reverses its polarity." -- (link) - mara Mar 14, 12:41 2
- "over a period of hundreds of thousands of years" It's not going to just happen and wreak havoc. -- nm - ceregon Mar 14, 12:44 1
  - actually, i don't think that's quite what that quote means, everywhere else says "Most reversals are estimated to take between 1,000 and 10,000 years" -- nm - Andie Mar 14, 12:50

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