Ключевые слова: adventure, ancient, black, burrow, burrowing, cave, cavern, caving, dark, dirt, earth, entrance, exploration, flow, flower, flowing, geologic, geology, grass, green, ground, hole, landscape, large, life, mount, mountain, mountains, natural, nature, outdoor, park, pathway, plant, range, relief, river, rock, small, stone, underground home, vivid, walking, wall, water, wet, wild, wildlife,