Ключевые слова: beautiful, beauty, blue, bright yellow, cleft, crack, crevice, crystals, dangerous, dioxide, eruption, gap, gas, geography, geological formation, geological rock, geology, hole, hot, hydrogen, hydrogen sulfide, landscape, mink, mountain, natural, nature, outdoor, poisonous, rock, rocks, scenic, slit, slot, smoke, source, spring, steam, stone, sulfide, sulfur, summer, tamagawa, tourism, travel, view, volcanic, volcano, white, yellow,