Wonders of the National Parks: A Geology of North America

Mammoth Cave, Wind Cave, Carlsbad Caverns (1x33)

Data emisji: Paź 22, 2015

Visit underground parks, exploring a tiny portion of the hundreds of miles of mapped passages in Mammoth Cave, Wind Cave, and Carlsbad Caverns National Parks. Consider the similarities and differences between these caves - two carved by mildly acidic rainwater, the other by dilute sulfuric acid!