(Kelly of the Clue Crew reports from inside Carlsbad Caverns Nat'l Park, New Mexico.)  The immense chambers in the cave at Carlsbad Cavern are the result of the aggressive dissolution of limestone by this acid, H2SO4
Seasonal Carbon Dynamics in a Northwestern Arkansas Cave: .... landscapes, 
caverns, and springs have resulted in some karst areas of the ... National Park 
and karst features of the Chester Upland and ..... sulfuric acid that attacked the 
carbonate bedrock ..... karst fissure in Carlsbad Cavern, New Mexico.