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 ...

Oh yeah and I did the math wrong in comparing the size of the cave to the grand canyon, turns out I'm better at geology than I am at math, go figure. The grand canyon is actually MUCH larger. Maduro ...

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 ...