Cave formation starts with a simple chemical reaction between water and carbon dioxide in the atmosphere, creating carbonic acid. This weak acid forms when rainwater combines with CO2, then ...

Cave explorers have traversed what's now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-meter-deep cave, which they named Delta Variant, in Tasmania's ...

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 ...