Form the basis of paleomagnetic dating Gratis sex cam jet
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Each region has its own unique master sequence since weather patterns are not the same from one area to another.However, the longer bristlecone pine sequence is of little value except for cross-checking the reliability of other dating techniques because logs of this species are rarely found in association with ancient humans.Periods of "normal" polarity (i.e., when the north-seeking end of the compass needle points toward the present north magnetic pole, as it does today) have alternated with periods of "reversed" polarity (when the north-seeking end of the compass needle points southward).
Paleomagnetism is possible because some of the minerals that make up rocks—notably magnetite—become permanently magnetized parallel to the earth's magnetic field at the time of their formation.The geomagnetic field changes on frequencies of 10s of microseconds (radio waves) to millions and perhaps billions of years.
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