In caves, water drips from the walls and leaves minerals behind. Over time, these can produce formations called stalagmites and stalactites. Now let's do a little review of where stalagmites and ...

(via PBS Terra) Below the Chihuahuan Desert in southeastern New Mexico, lies an extensive system of limestone caves, among them the pristine Lechuguilla Cave and the famed Carlsbad Cavern, home to one ...

Caves are some of the most interesting and perplexing features on our planet. Here's how they form! Oh yeah and I did the math wrong in comparing the size of the cave to the grand canyon, turns out ...

Mammoth Cave, the world's longest known cave system, stretches 426 miles under Kentucky. The cave's limestone began forming 330 million years ago when the region was submerged under an ocean. Visitors ...

Through the intricate study of lava tubes -- caves formed following volcanic eruptions when lava cools down -- an international team of researchers has uncovered clues about Earth's ancient ...

The Marble Caves sit on the shores of a turquoise glacial lake in southern Chile. Light bounces off the water onto the walls, creating a magical, ever-changing display inside the caverns. When you ...