"Sinkholes are most common in what geologists call, 'karst terrain'," the US Geological Survey explains. "These are regions ...

Antarctica, Earth's southernmost continent, is a place of extremes. Over 99% of Antarctica is covered in ice, which is up to 4.9 km thick inland, and extends over the sea in the form of ice shelves ...

Polar scientist Felicity Ashton reflects on her fascination with exploration and shares lessons on survival, risk, and ...

In the end, in the dark, it all came down to three things — experience, good judgment in the face of uncertainty, and penguin ...