Ключевые слова: adventure, afforest, ancient, below, bursting, cave, cavern, cliff, dark, darkness, deep, discover, earth, entrance, environment, exploration, explore, formation, geology, green, ground, hill, hole, inside, landscape, light, moss, mount, mountain, natural, nature, nobody, old, plant, prospect, rock, scenery, shadow, shine, shining, speleology, stone, tree forest, tunnel, under, undergroup, vacation, view, wild, woods,