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1915 in science
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==Earth sciences== * May 22 β [[Lassen Peak]], one of the [[Cascade Volcanoes]] in [[Northern California]], erupts, sending an ash plume 30,000 feet in the air and devastating the nearby area with [[pyroclastic flow]]s and [[lahar]]s. It is the only volcano to erupt in the [[contiguous United States]] between 1900 and 1980. * [[Alfred Wegener]] publishes his [[theory]] of [[Pangea]], which he calls ''Urkontinent''.<ref>''Die Entstehung der Kontinente und Ozeane'' ("The Origin of Continents and Oceans").</ref>
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