NCEA Level 2 Earth And Space Science Practice Questions - New Zealand Certificate Of Educational Achievement Level 2 Earth And Space Science Exam

Which property of silica-rich (rhyolitic) magma causes eruptions in the Taupō Volcanic Zone to be highly explosive?

Low viscosity allowing gases to escape easily High temperature causing rapid boiling High viscosity that traps expanding dissolved gases under pressure High density that forces rapid sinking of rock

Correct Answer:

High viscosity that traps expanding dissolved gases under pressure

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