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Which outcome enhances lahar formation during tropical storms?

A)Tephra deposit saturation increases rapidly
B)Pyroclastic flows fully erode gullies
C)Lava viscosity decreases instantly
D)Caldera lake evaporation prevents landslides

💡 Explanation

High saturation increases lahar probability because pore pressure drives slope instability during periods of intense rainfall and therefore reduces the resisting frictional forces rather than lower viscosity or rapid channel erosion influencing the initial slide event.

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