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26 Cards in this Set
- Front
- Back
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Pahoehoe
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Ropey Texture
Fast Moving Hot |
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A'a'
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Rocky Texture
Hot Slow Moving |
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Calderas
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Formed by collapse of a empty magma chamber
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Vesicales
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Escaping gases from lava leaves air pocket in rock
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Lava Tube
Example of a tube |
Insulates Lava
Transports Lava Hawaii = Thurston Lava tube |
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Pillows
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Mafic Magma erupts under H20
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Cinder Cones
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Small steep volcanoes built of mafic ash, scoria , lava
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Fumaroles
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Vents where volcanic gas escape
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Fissure eruptions occur where?
What may occur when earth splits |
Rift Zones
Lava curtain |
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Magma Composition (Silica affects?)
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Eruptions
Viscosity Crystallization Temp |
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# of shield volcanoes in Hawaii?
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5 overlapping
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Socria
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Vesicular Basalt
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What is present at yellow stone
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Continental Hot Spot
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What type of rock is hotter mafic of felsic?
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Mafic
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What drives partial melting
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Basaltic magmas intruding into continental crust (felsic). Mafic hotter than felsic
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Why is yellow stone a supervolcano?
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Large magma chamber
Felsic magma (rhyolitic) Explosive |
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Size of Caldera?
Mt St helens v crater lake v yellow stone? |
St Helens 1 mile
Crater Lake 5 miles Yellowstone 40 miles |
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Types of magma seen at Yellowstone
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Mainly felsic but also mafic
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What type of rock is seen at the Columbia River Plateau
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Basalt
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If gassy felsic magma is escaping it will most likely be a?
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Explosive eruption
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Geothermal Feature at Yellow stone
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Old Faithful
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Tuff
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Products of explosive volcanism
created by pyroclastic flow |
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Obsidian
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Volcanic Glass
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How are Geysers formed?
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When water is
superheated by the magma chamber at depth |
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How are rocks at Yellowstone formed
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created when pyroclastic flow compacts and "welds" together
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Mud pots
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Boiling sulfur rich mud
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