More than 25 years ago, as an anxious freshman at a small, private, liberal-arts college in the Midwest, I sat stoically in front of a midterm exam in introductory geology. The course had been ...

Add Yahoo as a preferred source to see more of our stories on Google. A unique, naturally formed, amphitheater-like formation of limestone is among the highlights of a forested 20-acre property on ...

The most common process by which limestone caves form involves carbonic acid — or weakly acidic groundwater — as the primary agent. When carbonic acid contacts limestone, it dissolves minerals in the ...

You would have a hard time finding these common Earth rocks on our neighboring planets. Here’s what makes our landscapes so unique. Limestone landscapes, like this one in the Stone Forest in China’s ...