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← GeographyWhich immediate volcanic consequence increases slope instability around stratovolcanoes?
A)Hydrothermal alteration weakening material✓
B)Pyroclastic flow lateral blast force
C)Lahar deposition sediment loading rate
D)Tephra reducing surface tensile strength
💡 Explanation
Hydrothermal alteration weakens the rock because circulating fluids dissolve minerals, therefore reducing shear strength rather than direct blasts and deposition, which are secondary effects; weakening dominates quickly during activity.
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