Ключевые слова: acid, america, basin porcelain, between, boiling, boiling mud, clouds, corrosion, danger, erosion, geology, geysers, hot springs, landscape, limestone, limestone formations, mud, mud pools, natures, norris, orange, panorama, park, sky, spa, steam, sulfur, summer, sun, tourism, toxic, travel, trees, united states, vegetation, water, wonderful, wyoming, yellowstone, yellowstone national park,