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phy6.org - 25 days ago

Millennium of Geomagnetism

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When lava flows out of a volcano and hardens, the result is often a black rock known as basalt. Basalt is slightly magnetic, and as it solidifies and cools, it becomes magnetized in the direction of the prevailing magnetic field. The process is somewhat similar to the capture of the prevailing ...

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Gates of Vienna — ... (1884-1958), the son of a Zen abbot, after studies at the Imperial University in Kyoto worked in Chicago with the American geologist Thomas Chamberlin (1843-1928). Matuyama proposed that long periods had existed in the geological past in which the polarity of the Earth’s magnetic poles was the opposite of what it is now. In a geomagnetic reversal the magnetic north and south become interchanged. In the past 4 million years there have been nine such ...