Term
| Light colored mostly non-ferromagnesian minerals? |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
| composition of ocntintental crust? |
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Definition
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Term
| Black mostly ferromagnesian minerals? |
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Definition
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Term
| Composition of oceanic crust? |
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Definition
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Term
| example of violet eruptions? |
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Definition
| mt. st helens in washington |
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Term
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Definition
| east rift zone of kilauea volcano in hawaii |
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Term
The violent character of an eruption is
controlled by the _____ and ____content of the magma? |
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Definition
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Term
measure of a material’s resistance
to flow? |
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Definition
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Term
| More viscous fluids are ____ and flow ____. |
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Definition
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Term
| The ____ the viscosity the more violent the eruption. |
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Definition
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Term
What controls the viscosity of a
magma? |
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Definition
| composition and temperature |
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Term
The more silica rich the magma the
more viscous it is (less readily it flows) because of the strong bond of the silicon-oxygen tetrahedron? |
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Definition
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Term
The hotter a fluid the less viscous
(flows more readily)? |
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Definition
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Term
| high ___ content results in violent eruptions. |
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Definition
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Term
| Gases expand within a magma as it ___ the Earth’s surface where pressures are _____. |
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Definition
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Term
| The violence of an eruption is related to how easily ____ escapes from the magma. |
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Definition
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Term
| Gas cannot escape easily from a viscous magma allowing it to collect resulting in more ___ ___ with gas rich viscious magmas. |
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Definition
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Term
The most violent eruptions will
occur with a magma that has the highest ___ content, lowest ___, high ___ content in a viscous magma. |
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Definition
| silicia; temperature; gas |
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Term
| violent eruptions is ___ to ___. |
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Definition
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Term
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Definition
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Term
| rhyolitic to andesitic magma have ___ ___ contents, ___ ___, and ___ ___ contents. |
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Definition
| higher silicia; lower temperatures; higher gas |
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Term
| Rhyolitic (granitic) composition magmas are so viscous they move like a ____. |
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Definition
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Term
| basaltic (mafic)- ___ ___ |
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Definition
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Term
| andestic- ___ compostiion |
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Definition
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Term
| rhyolitic (felsic/granatic)- ___ ___ |
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Definition
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Term
| rhyolitic is a rock type formed from ___(felsic) composition magma that cools at the surface forming tiny crystals. |
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Definition
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Term
| compared to rhyolitic to andesitic magma basaltic lava is ___ __, __ __ content, and __ __ __. |
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Definition
| silica poor, high melting temperature and high melting temperature |
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Term
| basaltic lava is very ___, flows in thin broad sheets or streams like ribbons and __ flowing. |
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Definition
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Term
| what percent of lava on earth is basaltic? |
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Definition
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Term
| rhylotic lava is most ___ ___, __ __ content, ___ ___ temperature. |
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Definition
| silicia rich, high gas; lowest melting temperature |
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Term
| rhylotic lava is very ___, and there is a rhylotic lava dome inside ? |
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Definition
| thick; mt. st. helens volcanic cone |
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Term
| Intermediate in character between basaltic and rhyolitic composition? |
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Definition
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Term
| andestic flow on ___ volcano in the ___ mountains,___. |
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Definition
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Term
| violent/explosive eruptions are ___ to ___composition magma with ____ ___ and moves ___. |
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Definition
| rhylotic to andestic; high viscosity; slowly |
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Term
| quiet/gentle eruptions are ___ composition magma with ___ ___ and flows ___. |
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Definition
| basaltic; low viscosity; gently |
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Term
| basaltic lava that forms basalt is ___ and has ___ which is where dark colored silicate minerals dominate. it is __-__ rich and ___,__,___,___ poor and is more ___. |
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Definition
| mafic; ferromagnesian; fe-mg; al,k,na,si; dense |
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Term
| andestic lava that forms andestic is ___ and is ___ in composition. |
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Definition
| intermediate; intermediate |
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Term
| rhylotic lava that forms rhylite is___/___ and is ___ which means light colored silicate minerals dominate . it is __-__ poor and __,__,__,__ rich and is less ___. |
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Definition
| felsic/granitic; nonferromagnesian; fe-mg; al,k,na,si; dense |
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Term
| basaltic, andestic, and rhylolitc lava all have ___ ___ size because of rapid crystallization at the earths surface. |
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Definition
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Term
| violent eruptions occur where magma must travel from the ___ through ___ ___ which is the ___ ___ and ___ ___ ___. |
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Definition
| mantle; continetal crust; subduction zones; continetal hot spots |
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Term
| locations of violent volcanic activity is the ___ of __ around the ___ ___ and ___. |
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Definition
| ring of fire; pacific ocean; yellowstone |
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Term
| gentle eruptions occur where magma must travel through ___ ___ at ___ ___ and ___ ___ ___. |
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Definition
| oceanic crust; spreading centers; oceanic hot spots |
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Term
| basaltic lava forms ___ ___, __ ___ and __ __. |
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Definition
| sheild volcanoes; flood basalts; lava tubes |
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Term
| andestic lava forms___ ___. |
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Definition
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Term
| rhylotic lava forms ___ ___. |
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Definition
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Term
| pyroclastic material is __to__ compostition and forms __ __. |
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Definition
| basaltic to andestic; cinder cones |
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Term
A mountainous accumulation (cone) from
successive eruptions of basaltic lava from a central
vent? |
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Definition
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Term
| exmaple of shield volcano? |
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Definition
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Term
the largest of
the volcanic cones? |
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Definition
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Term
| flows from fissure eruptions and forms lava platues and erupt in the same location for thousands of years? |
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Definition
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Term
| example of flood basalts? |
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Definition
| colombia river basalts and washington state |
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Term
| tunnels where lava continued to flow below the crust of solidified lava above and Can extend for miles from the eruption? |
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Definition
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Term
| examples of basaltic lava: rough jagged blocks? twisted braided? when lava flows into the ocean? |
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Definition
| Aa lava; pahoehoe lava; pillow lava |
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Term
| also called stratovolcano and explosive eruption of viscous gas-rich lava and repeated layers of lava and pyroclastic flow deposits? |
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Definition
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Term
| example of composite cones? |
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Definition
| mount st. helens in washington |
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Term
| where to find composite cones? |
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Definition
| ring of fire in pacific ocean and cascade range |
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Term
| form inside or on the flanks of composite cones? |
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Definition
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Term
| also called lava dome? exmaples of lava domes? |
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Definition
| volcanic dome; mt st helens and mt vesuvius |
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Term
| cone of ejected lava fragments (pyroclastics) cinder and pea to walnut sized? |
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Definition
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Term
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Definition
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Term
These are all associated with violent
andesitic lava composite cone eruptions! ___ flows(__ __), ___,__ __,___ ___. |
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Definition
| pyroclastic; nuee ardente; lahars; ash clouds; gas release |
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Term
a fluidized mixture of solid to semisolid
fragments and hot, toxic and
expanding gases and ash that flow
down the flank of a volcanic edifice and are the most deadly of all
volcanic phenomena? |
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Definition
| pyroclastic (nuee ardente) |
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Term
greatest volcano hazard on the planet
today? |
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Definition
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Term
Torrential mudflows of water saturated
volcanic ash? |
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Definition
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Term
from powerful explosions
commonly spread out above the tropospherestratosphere
boundary above the common
elevation of air traffic.? |
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Definition
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Term
| volcanic ash does not ___ in ___, stays ___; causes ___ problems. |
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Definition
| dissolve inwater; airbourne; respiritory |
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Term
| Inhaled volcanic ash can damages ___ ___. |
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Definition
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Term
| to predict eruptions we need ___ ___ and proper ___. we have predicted __ __ eruption. |
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Definition
| eruptive history; instruments; mt st helens |
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Term
Surrounding rock erodes away from the central
pipe of a volcano which is resistant to weathering.
Composite cone feature? |
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Definition
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Term
| example of volcanic neck? |
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Definition
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Term
| All igneous material solidified at depth and Subsurface part of the volcanic eruptions? |
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Definition
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Term
Massive Pluton: Main igneous body that solidified, uplifted and
eroded. Acts as a mountain core? |
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Definition
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Term
| Tabular Pluton: magma injected into fracture? magma injected along a bedding surface? |
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Definition
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Term
steep walled
depression at the volcano’s summit? |
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Definition
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Term
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Definition
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Term
sequence of events that formed
Crater Lake, Oregon? |
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Definition
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Term
| volcanic glass the size of clay? |
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Definition
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