Ключевые слова: adit, ancient, big, buildup, calcium, cave, cavern, dark, deep, dolomite, erosion, formation, fungus, geologic, geological, geology, grotto, high, huge, inside, landmark, landscape, large, light, limestone, mine, mineral, mineralogy, mountain, mushroom, mysterious, natural, nature, neoplasm, old, post, relief, rock, rocky, speleology, speleothem, stalactite, stalagmite, stone, structure, subterranean, texture, tourism, travel, underground,