Ключевые слова: america, area, autumn, black, calcium, color, colour, daytime, dead, exterior, fog, geology, geyser, geysers, horizon, hot, landscape, locations, mountain, national, natural, nature, outdoor, park, parks, phenomena, power, region, scenic, spring, sun, sunrise, surface, travertine, trees, trunks, usa, volcano, water, wilderness, world, wyoming, yellowstone,