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32 Cards in this Set
- Front
- Back
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What are the three types of Volcanic Products?
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Lava Flows, Pyroclastic Debris, Volcanic Gas
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What increases the viscosity of lava?
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silica
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A gray eruption refers to what characteristics of an eruption?
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Explosive and Pyroclastic
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A red eruption refers to what characteristics of an eruption?
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Effusive and Lava flows
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What increases the explosiveness of an eruption?
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The viscosity of the lava
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True/False: Gas bubbles escape easier from high viscous substances than from low.
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False
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What increases the explosiveness of an eruption?
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The amount of gas
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What are the controlling factors in volcano geomorphology?
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The type of eruption
The type of flow |
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What type of volcano has broad, sloped cones?
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shield volcano
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What type of volcano has low viscosity, silica content, and gas content, with thin lava flows?
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shield volcano
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What type of volcano is characterized by steep sloped piles of volcanic debris and some lava flows?
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cinder cones
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Which volcanoes have intermediate silica content, gas content, and viscosity, with thin lava flows?
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Cinder cones
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What volcanoes are characterized by alternating pyroclastic and effusive lava flows?
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Stratovolcanoes
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The volcano most likely to landslide is a
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stratovolcano
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What are the four parts of a typical volcano?
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Flake vent, crater, magma chamber, and summit vent
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what kind of flows are characterized by a ropy texture?
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Pahoehoe flows
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What kind of flows are characterized as rubbly with angular pieces?
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Aa flows
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What are blob like shaped pieces that form underwater?
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pillows
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silicic intrusive rock
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granite
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intermediate instrusive rock
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diorite
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mafic intrusive rock
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gabbro
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silicic extrusive rock
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rhyolite
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intermediate extrusive rock
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andesite
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mafic extrusive rock
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basalt
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what is powder sized, glassy debris?
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ash
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ash laden pyroclastic debris happened in what two places?
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Mt. Pinatubo, Phillipines
St. Augustine Volcano, Alaska |
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what are pieces of cooling lava that become streamlined as they travel through the air?
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bombs
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nuee ardente and glowing cloud refer to what phenomenon?
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pyroclastic flow
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What are the places pyroclastic flow has been recognized? (in the slides)
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Mt pinatubo, St augustine, Mt. St. helens, Soufriere Hills volcano in Caribbean Islands, Mayon Volcano - Phillipines, and 1902 disaster in St. Pierre (Martinique)
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What is a bubble trapped inside cooling lava?
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A vesicle
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What four gases are associated with volcanic gas?
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water vapor (H2)
carbon dioxide (CO2) sulfur dioxide (SO2) Hydrogen sulfide (HS) |
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What was the disastrous event that involved a dangerous gas eruption?
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Lake Nyos, Cameroon, Africa
1700 died when CO2 released from river |
