which means that as it gets dissolved there are no immediate signs at the surface. The overlying rock, sometimes clay or sandstone, will then suddenly collapse into the depression beneath - called a ...

But what exactly is a sinkhole, and what are the warning signs? Here’s everything you need to know. A sinkhole is a depression in the ground with no natural external surface drainage.

But what exactly is a sinkhole, and what are the warning signs? Here’s everything you need to know. A sinkhole is a depression in the ground with no natural external surface drainage. This means that ...