User talk:Jim Schrempp

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Earth science

Thanks for the input on the article. You wrote: "By reconstructing the positional drift of masses of bedrock, geologists have been able to determine that the the Earth's magnetic field has reversed polarity several times in the last 3 billion years." Do you have a source or two? I will look for online sources but a text or journal article would be nice. - Thomas Simmons 15:13, 20 April, 2007 (EPT) --> sent him several references.