Ключевые слова: blue, cloud, construction, deep, digging, dirt, dirty, earth, ecology, environment, garden, geology, grass, ground, heavy, high, hill, industrial, industry, iron, land, landscape, large, machinery, metal, mine, mineral, mining, mountain, nature, nobody, open, ore, outdoor, outside, pit, precipice, quarry, rock, sand, sky, soil, stone, strength, surface, trench, up, view, wall, work,