Ключевые слова: angular, arrangement, assortment, basalt, black, brick, brown, color, composition, contrast, cubes, density, diverse, earthy, elements, formation, formations, geological, geology, grainy, gray, hardened, hardness, irregular, lava, material, minerals, natural, porous, pumice, rocks, rough, roughness, scattered, sculpted, shapes, solid, solidified, stone, structure, surface, texture, variety, volcanic,