Volcanoes!
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Intraplate volcanism: HOT SPOTS AND MANTLE PLUMES. Although most volcanic rocks are generated at plate boundaries, there are a few exceptionally active sites of volcanism within the plate interiors. These intraplate regions of voluminous volcanism are called hotspots
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Ring of Fire: the linear zone of seismic and volcanic activity that coincides in general with the margins of the Pacific Plate.
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Lava: the molten, fluid rock that issues from a volcano or volcanic vent.
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Magma: hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed by cooling.
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Viscosity: the state of being thick, sticky, and semifluid in consistency, due to internal friction.
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Silica Content: the dioxide form of silicon, SiO 2 , occurring especially as quartz sand, flint, and agate: used usually in the form of its prepared white powder chiefly in the manufacture of glass, water glass, ceramics, and abrasives.