Ключевые слова: area, bacterium, blue, boiling, bright, color, colored, deep, descriptive, emerald, energy, extreme, forest, fossil, fumarole, geology, geothermal, geyser, heat, horizontal, hot, image, lake, landmark, landscape, mineral, national, natural, nature, pairs, park, pond, power, range, smell, spring, star, station, steam, sulphur, temperature, tree, turquoise, volcanic, volcano, water, wyoming, yellowstone,