Ключевые слова: acid, america, boiling, color, corrosion, danger, drop, erosion, geology, geysers, green, hot spring, hot springs, landscape, limestone, limestone formations, morning glory spring, mountain, natures, old faithful, old faithful basin, panorama, park, spa, spry, steam, sulfur, summer, sun, tourism, toxic, travel, united states, vegetation, water, wyoming, yellow, yellowstone, yellowstone national park,