The earth does rumble more with a lexurf...and amazingly, George has been lucid for once. 
Certain rocks have a magnetic signature. Sone rock that has been subducted, shows that our poles have switched magnetic polarity quite a few times...perhaps the mayans are right about 2012.

Certain rocks have a magnetic signature. Sone rock that has been subducted, shows that our poles have switched magnetic polarity quite a few times...perhaps the mayans are right about 2012.
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