Earth Sciences 1022A/B Lecture Notes - Lecture 4: Stratovolcano, Lava, Viscosity
13 Nov 2017
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Importance of dissolved gas: dissolved gases (volatiles) tend to increase the fluidity of magma, on their escape from magma, gases also provide enough force to propel magma from a volcanic vent, a surface opening, or conduit, (page 88) However, the lava is usually ble to move forward by breaking through the. Gases: (in textbook not on owl notes though pg. Pyroclastic materials: when mafic lava is extruded, dissolved gases escape freely and continually, pyroclastic materials (pyro=fire, clast=fragment): is another name for a cloud of ash, lava fragments carried through the air, and vapour. Such a flow is usually very hot, and moves rapidly due to buoyancy provided by the vapours. Anatomy of a volcano: (textbook p. 94, not on owl notes) Shield volcanoes: produced by the accumulation of fluid mafic lavas and are broad, slightly domed structures that resemble a warrior"s shield.
