GLY-1103 Lecture Notes - Lecture 2: Cow Dung, Eruption Column, Lateral Eruption
Document Summary
Ring of re: where the majority of volcanoes and earthquakes occur because of complex subduction and massive subduction at plat boundaries, plates are moving pretty quickly. De nitions: magma: molten rock beneath earth"s surface, we never see it, lava: molten rock exposed on earth"s surface, viscosity: relative uidity or rigidity of a material. low = runny, high = thicker. Ma c eruptions (ma - fe magnesium and iron: hawaiian style runny and pretty with mainly lava ows, low sio2 but lots of iron and magnesium, low viscosity, high temp, low gas content, usually produces a lava ow. Felsic eruptions (felsic high silicon: high sio2, high viscosity, lower temp, high gas content, explosive eruptions. Pyroclastic: intrusive: never erupted, rocks formed inside the earth, extrusive: from a lava ow, pyroclastic: exploded out of volcano. Ux melting - change the amount of volatiles. Introduction of volatiles can evoke an eruption: hotspots: related to mate plumes. examples - hawaii and storasula volcano, iceland.
