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Which 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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