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← GeographyWhich consequence results when aggressive dissolution widens joints of subsurface limestone?
A)Cover-subsidence sinkholes suddenly increase✓
B)Regional aquifers become impermeable bedrock
C)Glacial till enhances topographic drainage
D)Haloclines appear where rivers meet sea
💡 Explanation
Sudden increase in cover-subsidence sinkholes occurs because dissolution of limestone allows overlying sediment to collapse rapidly through voids; therefore sinkholes appear suddenly, rather than through gradual sagging processes or alternate geochemical effects.
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