This article examines the little known problems that sinkholes create in the United States every year, particularly in Southeast Minnesota, and what factors cause them to occur. According to Weiss, sinkholes cause approximately $300 million in damages annually. However, very few people recognize the problem that is literally right under their feet. And this problem is caused by karst geology, which can be found and have major consequences in about 25% of the nation. Weiss describes karst geology as a "system characterized by little topsoil over slowly dissolving bedrock such as limestone and sandstone." At any time, sinkholes can form as a result of the dissolving rock. In early October, the 14th annual international Show More
