|
the columbia plateau in the northwestern united states is an excellent example of |
flood basalts |
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which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface? |
pahoehoe |
|
What is associated with deep mantle hot spots |
the volcanoes of hawaii and quaternary activity in yellowstone national park |
|
the most violent volcanic activity is associated with |
composite cones |
|
what best describes volcanism in the cascade range |
relae to plate subduction |
|
which region has the greatest concentration of currently active volcanoes |
the circum-pacific area |
|
recent activity in yellowstone park is because |
related to intraplate, hot spot volcanism |
|
most of the active volcanoes on earth are located in a belt known as |
ring of fire |
|
volcanic bombs originate |
as erupted magma blobs that partly congeal before falling to the ground |
|
what is false about cinder cones |
particles are consolidated into welded tuff |
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what are usually the most abundant gases emitted during basaltic volcanism |
water and carbon dioxide |
|
which type of basaltic lava flow has its surface covered with sharp-edged, angular blocks and rubble |
aa |
|
kilauea and mauna loa are |
basaltic shield volcanoes |
|
which magma is most abundant type erupted at oceanic spreading centers |
basaltic |
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what volcano is very large with gentle sloping |
shield volcano |
|
what best describes the volcanic feature in new mexico |
the eroded remains of a volcanic pipe and radiating dikes |
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what is false about the eruption of 1980 Mt. St. helens |
the mountain peak was bult up by new lava flows |
|
the icelandic volcanoes are rleated to plate tectonics because |
they lie on a spreading center where two plates are moving apart |
|
cinder cones |
have very step slopes, are less than 100 ft high, and consist of pyroclastics |
|
which kind of eruptive activity is most likely to be highly explosive |
eruptions of big, continental margin, composite cones or stratovolcanoes |
|
what destroyed the city of st. pierre in 1902 |
heavy ashfall |
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in 1980 what was the first cascade range volcano to erupt since mt. lassen in 1925-16 |
mt. st. helens |
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kilauea is an example of what |
shield volcano |
|
what describes the big hawaiian volcanoes |
a deep hot spot |
|
paricutin is an example of what |
cinder cone |
|
magmqa tends to rise toward earths surface principally because |
rocks become less dense when melted |
|
what formed crater lake |
caldera collapse follwoed major ash and pyroclastic flows eruptions, 6000 years ago |
|
what is the largest known volcano in solar system |
olympus mons, mars |
|
spreading center volcanism most generally produces rocks that are |
basaltic in composition |
|
mount pelee is an example of what |
composite volcano |
|
what ocean basin is rimmed by most subduction zones |
pacific |
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what is an intrusive, igneous rock body that is tabular and concordant |
sill |
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the largest igneous intrusive body is called what |
batholith |
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which factors determine whether a volcanic eruption will be violent |
temperature, composition, and amount of dissolved gas in magma |
|
mt. st. helens is what |
an explosive stratovolcano |
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