Rainfall absorbs carbon dioxide and reacts with decaying
vegetation, creating slightly acidic water. When this water
reaches the limestone aquifer, it moves through spaces and
cracks slowly dissolving the limestone and creating a network of
cavities and voids. As the limestone dissolves, pores and cracks
are enlarged and carry even more acidic water. Water not only
contributes to the chemical dissolving of the limestone but it
also affects the support or lack of support provided to a cavity
when the water level changes. A sinkhole is formed when the land
surface above a cavity collapses or sinks into the cavity or
when surface materials are carried downward into the voids. A
natural drought or the pumping too much groundwater can leave
underground cavities empty. This can make conditions favorable
for sinkholes to form. Also, heavy rains following a drought
often cause enough pressure on the ground to create sinkholes.
Sinkholes can be triggered by human activities such as: • Over
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