Ключевые слова: background, brown, construction, development, dirt, dirty, energy, environment, equipment, excavator, exploration, fine, gravel, gray, ground, heap, hill, industrial, industry, line, material, mine, mineral, natural, open, outdoors, pattern, pit, power, quarry, road, rock, rough, sand, shape, small, special, stack, stone, structure, technology, texture, tire, track, tracks, transportation, truck, tyre, white, work,