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