(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
.... 51Limestone inclusions in a gypsum block, Big Room, 
Carlsbad ..... Sulfuric acid dissolved out the large Solution Stage III cave 
passages, and silt... [DOC] [TLE] Another World, Underground: Carlsbad Caverns National Park in ... [PAR] Sep 16, 2012 ... Cave formations in the Big Room at Carlsbad Caverns National Park near ... Site 
in the American Southwest, near the city of Carlsbad, New Mexico.