http://www.livescience.com/environment/How-Do-Sinkholes-Form-100601.html How Do Sinkholes Form? By Stephanie Pappas, Life’s Little Mysteries Contributor posted: 01 June 2010 12:37 pm ET In the aftermath of Tropical Storm Agatha, a 330-foot-deep sinkhole opened up in the middle of Guatemala City. Like all sinkholes, the one in Guatamala City formed when a swath of land collapsed, leaving behind a… Read more