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1900 in science
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==Earth sciences== * January 5 β Physicist Dr [[Henry Augustus Rowland|Henry A. Rowland]] of [[Johns Hopkins University]] in [[Baltimore]] announces his theory that the cause of [[Earth's magnetic field]] is its own rotation, based on experiments to produce [[magnetism]] by the rotation of a motor.<ref>{{cite news|title=Magnetism of the Earth|newspaper=The New York Times|date=January 6, 1900|page=1}}</ref> * [[Richard Dixon Oldham]] distinguishes between primary, secondary and tertiary [[waveform]]s as recorded by [[seismometer]]s.<ref>{{cite web|first=Andrew|last=Grout|title=Oldham, Richard Dixon (1858β1936)|work=[[Oxford Dictionary of National Biography]]|publisher=Oxford University Press|year=2004|url=http://www.oxforddnb.com/view/article/37820|doi=10.1093/ref:odnb/37820|accessdate=2011-10-20}} {{ODNBsub}}</ref>
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