Hanover Area
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Hanover Area - In areas underlain with limestone and dolomite, sinkholes often form from fissures in the rocks enlarging and finally forming a funnel-shaped depression.  Some sinkholes are also created by the failure of a cave roof.  Sometimes sinkholes can cause serious damage to buildings or roadways.   This road sign is in the vicinity of the Vulcan Materials quarry north of Hanover.  The quarry is pumping up to seven million gallons of water out daily, which would also cause a lower water table (thus a void).  Over time, gravity will take over even under ground, causing ceiling failure in this cave.  Photo courtesy of G. Patrick Bowling, P.G.

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