caverns

The caves resulted from the accumulation of layers of limestone over millions of years. The caves are confined to a 100 feet thick zone. Rain water trickles, dissolving the carbon dioxide to make a mildly acidic solution of carbonic acid (secondary school chemistry, people). The acidic water percolates through the limestone, eroding layers and carving out shapes in the cave. A precipitate of lime forms, making stalactites from the ceiling and stalagmites from the ground join together to form limestone pillars. It is like witnessing a chapter out of a Geography textbook right in front of you. This is an active cave and new deposits are formed @ one cubic inch in 120 years.