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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.
Stratovolcanoes form by alternating __ of pyroclastic material (ash) and thick __ flows.
Shield volcanoes due to extensive outpouring of __/basaltic lava with little pyroclastic material.
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