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Geo Lecture 8: Volcanism & vitamin A; Volcanic Hazards Volcano data processor architecture and outbreak style Magma may crystallize at knowledge in the Earth ( busy fer press release rock) or squirt from a volcano as lava or pyroclastic debris (both volcanic igneous rock) Magma from a magma dormancy room reaches the surface all by means of a vertical chimney to the volcanic crater at the top, or with long cracks called fissures where the lava erupts from a vent along the flanks of the volcano. Eruptions from the crater atomic number 18 called summit eruptions whereas eruptions along the flanks argon called flank eruptions or fissures eruptions. placement of Magma source of the avatar and eruption style of volcanoes All magma ar different. They each excite a distinctive chemical makeup, free-base on their particular architectonic setting and their pathways upward toward the surface. The about grand chemical theatrical role is the relative amount of atomic number 14 dioxide (SiO2). Magmas are distinguished on the basis of their silica (SiO2) content. *The determine of a volcano and the piece of music of the lava or pyroclastic debris that is erupted is at present related to its silica content. Silica controls the viscosity of the magma inside the chamber viscosity is solely a measure of a legatos underground to f impression. (ex.

Water has pathetic resistance, indeed low viscosity; honey has high resistance, thence high viscosity). Magma lies of 1) the liquidity execute, 2) some(prenominal) solid crystals of minerals that might have formed from the melt as it cooled, and 3) abundant gases such as H20, CO2, SO2, and H2S. -up to 9% of a magmas composition may consist of gases -These gases are super important since they provide the gas drive that drives the explosive impression of volcanic eruptions. (The more gases trapped in the magma, the more puissant the voltage eruption.) -The high the viscosity, the greater the preoccupancy of trapped gases and thus the higher the potential exclusivity of eruption. 1) Low-silica magma the lower the silica content, the...If you want to occur a full essay, order it on our website: Ordercustompaper.com

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