Ключевые слова: acid, activity, barren, blue sky, boiling, california, devils kitchen, earth, environment, environmental, forest, fumarole, gas, geology, geothermal, harsh, hell, hot, hydrothermal, lake, landscape, lassen, national park, nature, pool, science, smoke, spring, steam, sulfur, toxic, travel, trees, turquoise, vent, volcanic, volcano, warner valley, water,