Magma with high silica content tends to be - Answer-very viscous
magma with low silica content tends to be - Answer-very fluid
submarine eruptions of volcanoes - Answer-form pillow basalts
which type of volcano is commonly composed of andesite - Answer-composite volcano
an igneous rock ...
dike - Answer-discordant tabular intrusions(vertical cuts)
obsidian is an igneous rock that - Answer-solidified very rapidly to form volcanic glass
the most common type of volcano is n the "ring of fire" is - Answer-composite volcano
a volcanic rock composed of olivine, pyroxene and plagioclase is a - Answer-mafic
volcanoes compromised mainly of pyroclasts are known as - Answer-cindercone
volcanic eruptions around the circum-pacific belt to be very ____ and form ___
volcanoes from which ___rocks form - Answer-explosive, composite, andesite
volcanoes and atmospheres - Answer-originally created from gases released from
volcanic eruption
volcanoes and hydrosphere - Answer-produced by condensation of volcanic water
vapor
volcanoes and biospheres - Answer--lava flows and ash weather to produce fertile soils
-violent eruptions can destroy all life
-lots of ash and gases at atmos can trigger rapid climate change and mass extinctions
, lava - Answer-produced when magma reaches earths surface. molten rock that is
extruded on earths , igneous
pyroclasts - Answer-rapidly cooled rock fragments from eruption
what forms extrusive igneous ricks and volcanoes - Answer-pyroclasts and lava flow
May 18,1980 - Answer-Mt. St. Helens erupted, North America plate was overriding part
of pacific ocean floowr.
geothermal energy - Answer-underground heat created steam or superheated water
can be dripped and conveyed into pipes for electrical use
violence of eruptions controlled by - Answer-dissolved gaes, viscosity (fluids resistance
to flow determines how readily gas escapes)
temp of lava solidification - Answer-700-1200
mafic lava produces which rock - Answer-basalt, low in siO2, low in silica
silicic lavas are high in __ and produce which rock - Answer-siO2 and produce rhyolite
lavas of intermediate composition form which rock - Answer-andesite
gases in volcanoes - Answer-most is steam and water vapor but also CO2, Sulfer
dioxide and hydrogen sulfide
gases and pyroclasts - Answer-during eruptions, expanding gases propel pyroclasts in
the atmos
pyroclastic fall - Answer-theyre transported by winds and eventually settle back down to
Earth
pyroclastic flow - Answer-mixture of gas and pyro thats so dense it hugs ground as it
rapidily flows down the volcano
extrusive textures - Answer-grain size, glassy, fine grained, porphyritic
grain size - Answer-most important.
rate of cooling and viscosity
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