GEOL 1010 Lecture 12: VOLCANOES
28 Oct 2016
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Includes: volcanoes; submarine flows; fissure flows: anatomy. Conduit: circular opening in volano, moves magma to the surface. Vent: opening at the surface of the volcano. Caldera: very large depression - from summit collapse. - around the ring of fire" -- west coast of north. America, hot spots in hawaiian islands, east coast of asia. Eruptions (are explosive vs. non-explosive depending on:: gases: more gases, more explosive. If pressure decreases, gas bubbles become larger and can explode. Think like a soda can: viscosity: resistance to flow. If something is thicker, it"s more viscous (harder to flow, think honey). Thinner, more likely to flow (gases are likely to escape, magma flows easily). If a magma is more viscous, more explosive (difficult to flow and traps gas). Silica content of magma - less silica, less viscous. ): felsic and intermediate magmas have more silica and are more explosive. Ex: cascade range, british columbia to ca (mt.
