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← GeographyWhich outcome arises when heavy tephra accumulates post-eruption?
A)Lahars initiate via rainwater saturation✓
B)Magma viscosity increases drastically
C)Pyroclastic density currents intensify
D)Shield volcano formation accelerates
💡 Explanation
Lahars initiate because excess tephra increases overland flow via water-induced bulk transport; this saturation triggers mudslides. Therefore, lahars form, rather than changes to magma or eruption style, which depend on internal volcanic processes.
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