ACT Science Practice Question #1631 (Hard (640)) | Test Citadel
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ACT Science Difficulty: Hard (640)

Digital ACT Science Practice Question #1631

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Based on Table 2, at 1000°C, how does the viscosity of rhyolitic magma compare to the viscosity of basaltic magma? 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
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10,000,000 / 10,000 = 10^7 / 10^4 = 10^3 = 1,000 times greater.

Masterclass Solution & Distractor Trap Analysis

At 1000°C, rhyolitic magma has a viscosity of 10,000,000 poise. Basaltic magma at 1000°C has a viscosity of 10,000 poise. Dividing: 10,000,000 / 10,000 = 1,000 times more viscous....

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