Why does magma viscosity vary with silica content?
A) There is no correlation between silica content and magma viscosity.
B) Increasing silica content increases the amount of water a magma can dissolve and water decreases magma viscosity, so increasing silica content decreases magma viscosity.
C) Increasing silica increases a tendency for silica bonds to link up in networks, acting like a polymerization of the magma.
D) Increasing silica content lowers the melting temperature and since increasing the temperature of a magma decreases viscosity increasing silica content increases viscosity.
C
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