Digital ACT Science Practice Question #1632

A volcanologist hypothesizes that explosive volcanic eruptions are fueled by expanding volatile gases unable to easily escape high-viscosity magmas. Based on Table 2, which magma erupted at 900°C would present the greatest hazard for an explosive eruption? Passage Context (Planetary Geology): Geologists tested the relationship between silica (SiO2) weight percentage, temperature, and magma viscosity (measured in poise) for three volcanic magma compositions: Table 2: - Basaltic Magma (48% SiO2): 1200°C -> 100 poise | 1100°C -> 1,000 poise | 1000°C -> 10,000 poise - Andesitic Magma (58% SiO2): 1100°C -> 30,000 poise | 1000°C -> 250,000 poise | 900°C -> 3,000,000 poise - Rhyolitic Magma (72% SiO2): 1000°C -> 10,000,000 poise | 900°C -> 100,000,000 poise | 800°C -> 1,000,000,000 poise