On May 31, 2007, at 1:51 PM, Ed Leafe wrote:
>> Huh? How does that happen? Must the always be equal and opposite of
>> each other?
>
> This has been observed in rocks from various parts of the world in
> which magnetic crystals abruptly reverse direction. Normally they
> align with the Earth's magnetic field, so the only explanation that
> would take into account this on a global basis is that the polarity
> of the magnetic field flipped.
More info:
http://www.sciam.com/article.cfm?articleID=000ACB8C-81D1-1074-
BCFA83414B7F0000&sc=I100322
( -or- http://tinyurl.com/26r5qx )
-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com
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