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The limits of volcanology, like those of any other science, defy strict definition. Its problems are closely bound to those of structural geology, petrology, seismology, and geophysics, for orogenesis and the movement and formation of magma are mutually dependent processes. Primarily, however, the volcanologist is concerned with the eruption of magma upon the surface of the earth and into levels not far beneath. The present historical sketch has been written with this in mind.1

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