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After rapid tephra deposition from Plinian eruptions, which outcome diminishes slope erodibility?

A)Short-term soil aggregate stabililization
B)Increased pore water pressure
C)Elevated surface water runoff
D)Decreased vegetative ground coverage

💡 Explanation

Increased soil aggregate stabilization reduces erosion because clay particles bind tephra through electrostatic attraction, forming larger, more resistant clumps. Therefore, option A is correct rather than increased runoff or pore water pressure because the tephra stabilizes via aggregation.

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