Ключевые слова: adventure, ancient, arid, background, cave, cliff, dark, daylight, desert, discovery, earth, environment, exploration, formation, geological, geology, glow, grotto, ground, hanging, hanging light, illumination, interior, landscape, lantern, light, metal, mineral, natural, nature, outdoors, rock, sandstone, scenic, speleology, spelunking, stone, structure, subterranean, surface, texture, tourism, travel, underground, warm,