lab 4 volcanoes and volcanic hazards
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33 Terms
shield volcano
height divided by half of its width is less than 0.18
composite volcano
height divided by width is greater than 0.18
topographic map
shows elevation using contour lines
contour lines
lines of equal elevation
how to determine height of volcano
(elevation of summit) - (elevation of base)
viscosity
resistance of a liquid to flow
low viscosity eruptions
more fluid, less sticky, flow easily
high viscosity eruptions
stickier, lava piles near vent
mafic
low viscosity
intermediate
intermediate viscosity
felsic
high viscosity
what produces the most explosive eruptions?
high viscosity and high gas
what kind of magma do shield volcanoes form?
mafic
what kind of magma do composite volcanoes form?
intermediate/felsic
felsic igneous rocks
muscovite, quartz, potassium feldspar
intermediate igneous rocks
amphibole, biotite, plagioclase feldspar
mafic igneous rocks
olivine, pyroxene
phaneritic
can be seen with naked eye
aphanitic
microscopic
felsic rocks
rhyolite, granite, obsidian, pumice
intermediate rocks
andesite, diorite, pumcie
mafic rocks
basalt, gabbro, scoria
rhyolite : fine-grained (aphanitic)
granite : coarse-grained (phaneritic)
obsidian: glassy
pumice : vesicular
andesite : fine-grained (aphanitic)
diorite : coarse-grained (phaneritic)
basalt : fine-grained (aphanitic)
gabbro : coarse-grained (phaneritic)
scoria : vesicular
what rocks would be found at shield volcanoes?
basalt, gabbro, scoria
what rocks would be found at composite volcanoes?
rhyolite, andesite, granite, diorite, obsidian, pumice
Note 
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