What Is the Connection Between the Amount of Silica in a Melt

question 27

Multiple Choice

What is the connection between the amount of silica in a melt and how viscous it is?

• A) Higher silica content lowers the melting temperature and since increasing the temperature of a magma decreases viscosity increasing silica content increases viscosity.
• B) Silica forms strong bonds, so higher amounts of silica make for more viscous magma.
• C) Higher silica content means a larger 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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