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← GeographyWhich mechanism dominates karst cave enlargement below base level?
A)Hypogene speleogenesis from deep aquifers✓
B)Erosion from surface stream entrenchment
C)Mechanical roof collapse sedimentation
D)Epigene recharge from surface runoff
💡 Explanation
Hypogene speleogenesis causes cave enlargement because groundwater, saturated at depth, dissolves limestone; therefore, cave systems develop upward rather than just from surface recharge, because hypogene dissolution occurs from below.
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