What is the effect of silica when it's in lava?

Question

BlackTom AI · Accepted Answer

When considering how silica content affects lava, the main concept to grasp is that silica tetrahedra form networks that make molten rock thicker and stickier.
Option 1: 'The greater the amount of silica in the lava, the more viscous it is.' This statement aligns with silica- rich lava forming a stronger silicate network, which increases viscosity and hinders flow.
Option 2: 'The viscosity of lava is not related to how much silica there is in the lava.' This is incorrect because silica content is a primary control on viscosity in most magmas; ignoring it overlooks a fundamental relationship in petrology.
Option 3: 'A lava that has no silica at all will never be able to melt.' This is false; silica-free lava is not a meaningful real-world concept, and melting behavior depends on temperature, pressure, and composition; silica presence is not a binary gate for melting.
Option 4: 'The greater the amount of silica in a lava, the less viscous it is' This contradicts well-established geology: increasing silica generally increases viscosity, not decreases it. The statement reverses the accepted trend and misrepresents the chemistry-structure relationship in silicate melts.

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