A magma's viscosity and tendency to cause explosive eruptions depends on its composition, temperature, and volatile gas content.

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Quizplus · Accepted Answer

This statement is true. The viscosity of magma is determined by the amount of silica and other viscous materials present. A high viscosity magma is more likely to cause explosive eruptions due to the build-up of pressure from trapped gases. The temperature of magma can also affect its viscosity, as hotter magma is typically less viscous. The presence of volatile gases, such as water vapor and carbon dioxide, can also increase the likelihood of explosive eruptions.

A Magma's Viscosity and Tendency to Cause Explosive Eruptions Depends