Ключевые слова: activity, area, blue, boiling, bubble, clay, color, crater, crust, europe, field, fumarole, gas, geological, geology, geothermal, hot, hverarond, hverir, iceland, icelandic, krafla, landscape, mars, mountain, mud, myvatn, namafjall, natural, nature, outdoor, pool, pot, red, scenery, sky, smoke, spring, steam, steaming, sulfur, sulphur, surface, temperature, thermal, travel, vertical, volcanic, yellow,