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Geology
Volcanoes
Plate Tectonics

How does the content of magma change how viscous it is?

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September 04, 2008 7:27AM

Silica content determines viscosity. The higher the silica content the more viscous (slower moving). Ultramafic <45% silica Least viscous Mafic 45-52% Silica Intermediate 53-65% Silica Felsic >65% Silica Highly viscous