Surface Depression News Today

Surface. its caused by very old limestone that is near the surface that has been dissolving for millions of years. reach a point where you develop cavities and caverns in the limestone large enough that they are no longer able to support the roof of the cavity and the cavity collapses and anything above it, sand, clerics and any house that might be there, they fall in and you have the surface depression that we call a sink hole. >> and, professor, explain how this 26-year-old young man jeff, who...