These are most common in South Wales where sandstone rocks lie above caves in the limestone. But human activities can also accelerate the formation of sinkholes or cause the ground to collapse in ...

Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, ...

For millions of years, a natural stone arch stretched over a part of Rock Creek Bay in Glen Canyon National Recreation Area ...

Some scientists believe that Upheaval Dome was formed by a mountain of salt rising beneath southeastern Utah's sandstone layers. A thick layer of salt originating from ancient landlocked seas sits ...