Why Does Magma Viscosity Vary with Silica Content

question 76

Multiple Choice

Why does magma viscosity vary with silica content?

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

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