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← GeographyWhich mechanism causes accelerated dome collapse in stratovolcanoes?
A)Increased hydrothermal alteration weakens material✓
B)Decreased magma viscosity increases lava supply
C)Increased plagioclase crystal formation interlock
D)Decreased vent temperature resists fracturing
💡 Explanation
Increased hydrothermal circulation alters minerals within the dome via hydrolysis/oxidation. This reduces shear strength, therefore dome destabilization occurs rather than stable growth because water changes its effective crystal structure.
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