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Join Date: Feb 2004
Location: Seattle, WA, USA
Posts: 1,330
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It has long been known that the Earth's magnetic poles shift and sometimes reverse (as metal bearing magma exudes from plate fractures and cools, the iron is magnetized by the magnetic forces; when the poles shift or reverse, it can be detected.) Prior to a pole shift the strength of the magnetic field that surrounds the earth lessens, goes to zero then strengthens. In geologic time, the change is a blink of the eye but in human terms, it is actually hundreds of years. Right now the magnetic field acts as a protective field that keeps much of the solar ratiation away from us (ie the Van Allen Radiation Belt - also often visible as the Aurora Boriales). Studies indicate that we appear to be entering an era of lessening The years without any magnetic protection may not sterilize the earth but we would all have the same tan
Here is a pointer to the NOVA show on the subject:
http://www.pbs.org/wgbh/nova/magnetic/
Here is a pointer to the NOVA show on the subject:
http://www.pbs.org/wgbh/nova/magnetic/
Last edited by GrimJack : Nov 12th, 2007 at 2:45 pm. Reason: hit the wrong key
If we don't allow freedom of speech,
how will we know who the a-holes are?
GrimJack
ASUS A8V Deluxe;AMD a64 3200+ 939
G-force 7300GT/512meg AGP
how will we know who the a-holes are?
GrimJack
ASUS A8V Deluxe;AMD a64 3200+ 939
G-force 7300GT/512meg AGP
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Join Date: Aug 2007
Location: New Hampshire
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Solved Threads: 31
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Join Date: Aug 2007
Location: New Hampshire
Posts: 3,417
Reputation:
Rep Power: 9
Solved Threads: 31
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