Sinkholes are a worldwide phenomenon—geologists estimate that 10 percent of Earth’s surface (including the entirety of Florida) is shaped by dissolving bedrock prone to sinkholes, a type of landscape called karst topography. Nearly every U.S. state is covered at least in part by karst topography and sinkholes are considered most common in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania. Check out the U.S. Geological Survey’s map of the U.S.’s karst areas here.
KARST
That’s the term I keep forgetting.
For those curious about how these thgs happen, run a Google search on “KARST”, looking at the definitions and images (right after you tie yourself off to something that won’t sink. <:^)
I could be wrong here but somewhere I heard that a fairly large part of what is now southern Florida is a huge impact crater from an ancient meteor. Jus’ sayin’.