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GEO 2152 - Lecture 7

Lecture 7

TermDefinition
Magma found deep within the crust and upper mantle
Lava found flowing from an erupting volcano
Viscosity resistance to flow
Shield Volcanoes largest volcanoes on Earth & are shaped as broad arc built from lava
Tephra fragmented material blown out during an eruption
Pyroclastic deposits accumulations of tephra
Pyroclastic rock accumulations of tephra compacted together
Composite Volcanoes cone-shaped & are built from a combination of lava flows & pyroclastic deposits
Volcanic Domes steep-sided mounts that from around vents
Cinder Cone Volcanoes: round to oval shaped & contain a crater on the top
Maars a circular volcanic crater produced by an explosive eruptions are filed w/ water
Jokulhlaups huge quantities of ice producing hoods
Crater a depression formed by the explosion of a volcano top
Volcanic Vent an opening on the surface through which lava & pyroclastic debris erupt
Fissures vents that are elongated cracks
Caldera a circular to oval depression formed during the collapse of a volcano
Geyser groundwater that boils in an underground chamber to periodically produce a release of steam or water
Cooling ash & gases reflect solar radiation
Pahoehoe Basaltic Lava low viscosity, high temp
Aa Basaltic Lava: High viscosity, low temperature
Lateral Blasts an eruption directed away form a volcano where materials are blown parallel to the surface
Pyroclastic Flows: avalanches of ash, gas & rock fragments that travel down the slopes of a volcano during an explosive eruption
Vog smog from the formation of acid precipitation
Lahar a large amount of material that has become saturated with water & moves downslope
Created by: nickicais
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