Ключевые слова: abstract, architectural, architecture, background, black, coal, cobblestone, color, construction, covering, energy, floor, fortified, fossil, fuel, granite, gravel, gray, group, heap, heat, improvement, industry, large, material, mineral, mining, nobody, object, ornamental, outdoor, pattern, paving, pebble, pollution, power, rock, rough, siding, stack, stacked, stone, strength, textured, toughness, wall,