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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lectknancy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
