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Lecture 9

Lecture 9.pdf

6 Pages

Earth Sciences
Course Code
Sergei Basik

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Volcanoes Tectonic Environments Eruptions and ProductsLecture 9 September 25 2013 Vulcan lat Vulcanusin Roman religion the god of fire and the forge 1 Volcanoes General Introduction A volcano is hill or mountain formed at a vent from which molten rock or magma and gases reach the Earths surface and eruptOnce the magma reaches the surface it is called lavaMagma chambers are large masses of molten magmaA hot rock deep within the Earth may melt by increased temperature decreased pressure or addition of waterDiagram Courtesy of USGSThe violence of a volcanic eruption depends onviscosity how fluid the magma is volatiles the quantity of water vapor and other volcanic gases it containsvolume the type and amount of magma
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