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← GeographyWhich risk increases when heavy rainfall saturates epikarst?
A)Sudden sinkhole collapse✓
B)Increased surface albedo
C)Decreased soil pH
D)Enhanced carbon sequestration
💡 Explanation
Heavy rainfall saturates the epikarst, increasing pore pressure. This reduces effective stress, triggering **mechanical weathering** leading to sinkhole collapse because the soil's cohesive strength is exceeded, therefore sudden collapse rather than gradual subsidence occurs.
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