What is viscosity? What is the effect of temperature and composition on the viscosity of magma? At
the same temperature, which composition of magma will be the most viscous: felsic, intermediate, or
mafic? Which will be the least viscous? What will be an ideal response?
Viscosity is resistance to flow. Higher temperature fluids have less viscosity than lower temperature
fluids. In magma, higher silica magmas are more viscous than magmas with less silica. So mafic
magmas are the least viscous, and felsic magmas are the most viscous.
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