What is a volcano?

Jun 30th, 2015
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•From word Vulcan, Roman god of fire and metal working •Geologic landform where molten rocks from the planet’s interior are ejected to the surface.

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LECTURE 5VOLCANISMWhat is a volcano?From word Vulcan, Roman god of fire and metal workingGeologic landform where molten rocks from the planets interior are ejected to the surfaceGeneric Volcano FeaturesCentral VentSummit CraterEdificeMagma ChamberParasitic ConesFumarolesHow do we know if a volcano is active?Active erupted during the last 10,000 yrs.- Inactive no activity during the last 10,000 yrs.- Potentially active - volcanic activit between 10 ka 1.65 Ma Types of volcanoesBased on morphology and building materialsTypes of VolcanosSheild volcanos produced by the accumulation of fluid basaltic lavas and exhibit the shape of a broad slightly domed structure that resembles a warriors shield (grown up mostly from the deep-ocean level, not all)Ex. Mauna Loa (largest volcano), KilaueaCinder Cones (also called Scoria Cones) built from ejected lava fragments that take on the appearance of cinde4rs or clinkers as they begin to harden while in flight, usually the product of a single eruptive episode that sometimes lasts only a few weeks and rarely exceeds a few years, once this event ceases the magma in the pipe connecting the vent to the magma chamber solidifies and the volcano never erupts again = short lifespanEx. ParicutinComposite Cones (stratovolcanoes) large, nearly symmetrical structure composed of both lava and pyroclastic deposits, product of gas-rich magma having an andesitic comp

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