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← GeographyWhich risk increases when low-silica lava cools rapidly?
A)Formation of glassy volcanic rock✓
B)Development of aa lava flows
C)Decreased explosivity of the eruption
D)Increased stability of composite volcanoes
💡 Explanation
The risk of forming glassy rock increases due to rapid cooling preventing crystal formation; this is vitrification. Because the lava’s atoms freeze in a disordered state rather than developing mineral structures, aa lava requires slower crystallization and viscosity, therefore these alternatives are not as favoured.
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