Igneous rocks form by the?
solidification of magma or lava
Importance of igneous rocks?
building materials, ores
Igneous rocks distribution?
Canadian Shield, Rocky Mtns, Appalachian Mtns, Central TX
Igneous rocks compose __% of basement rock. 85% is metamorphic.
What are the two types of magma/lava?
silicic and mafic
What is silicic magma/lava?
>50% SiO2, gooey, highly viscous, becomes explosive, convergent system associated with continental crust formation.
What is mafic lava/magma?
<50% SiO2, very fluid, non-explosive, quiet, low viscosity, divergent associated with oceanic crust.
Silicic rocks are generated with __ zones at __ plate boundaries as magma chambers.
Silicic rocks process via __.
When solidified, magma chamber becomes a __ composed of granite and/or diorite.
Stratovolcanoes form by alternating __ of pyroclastic material (ash) and thick __ flows.
Caldera formation from collapsed craters are like?
What is divergent?
plates moving away from eachother
what is convergent?
plates moving toward one another
Mafic rocks are generated at __ (divergent plate boundaries).
Mafic rocks are also generated within the __ crust.
Shield volcanoes due to extensive outpouring of __/basaltic lava with little pyroclastic material.
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.