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← ScienceWhich outcome results when high-silica volcanic magma undergoes rapid cooling?
A)Formation of obsidian glass occurs✓
B)Formation of pumice stone occurs
C)Formation of a basalt rock occurs
D)Formation of rhyolite porphyry occurs
💡 Explanation
Rapid cooling prevents crystal formation, so glass formation will occur. Vitrification is the mechanism where disordered molecules solidify because molecules lack kinetic force to crystallize; therefore, the outcome is obsidian rather than other crystalline rocks under slow cooling.
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